About Us

Prüfengel offers authentic consumer tests in which real users share their experiences with products. Our tests are based on practical applications in everyday life and reflect the opinions of consumers. As we focus on consumer tests, we do not carry out any material, long-term or laboratory tests. The tests are carried out by 1-2 independent consumers over a period of 7-14 days. The exact test conditions can be viewed in the test plan of the respective test report – click here to go directly to the test plan.

Manufacturers provide the tested products free of charge. We charge a one-off test fee for carrying out the tests. In addition, manufacturers pay an annual licence fee for the use of the Prüfengel seal. We also receive a commission for linking to manufacturers’ websites. These remunerations have no influence on our test results or ratings.

We guarantee transparency and a fair evaluation. For a detailed insight into our comprehensive evaluation process, please click here.

KaiserRein
Glass cleaner concentrate

Our extensive tests and evaluations have shown that the Profi glass cleaner concentrate with lotus effect from KaiserRein deserves an extremely positive assessment. This product, based on advanced nanotechnology, is characterised by its exceptional performance and quality.

KaiserRein Glass Cleaner is extremely effective at removing dirt from various glass surfaces, including mirrors, window frames, conservatories and car windscreens. It enables quick and thorough cleaning without annoying streaks or smears. This leads to an impressive result that is equally appreciated by professional building cleaners, households with large glass surfaces, garages and car valeters.

The concentrate contains selected surfactants that ensure streak-free cleaning , as well as ammonia to boost cleaning. During the cleaning process , it leaves behind an antistatic protective film that prevents dirt particles from sticking again. In addition, special gloss film formers help to give the treated surfaces a radiant shine .

KaiserRein glass cleaner is extremely easy and time-saving to use . You can prepare a highly effective cleaning solution with just a small amount of concentrate, around 25 ml per 5 litres of water. Cleaning is effortless and requires no time-consuming polishing.

Overall, KaiserRein Glass Cleaner Concentrate Professional with lotus effect is a highly recommended product that not only delivers excellent cleaning results, but is also extremely economical and economical. Our test institute rates this product extremely favourably and recommends it for a wide range of applications.

Advantages

Streak-free cleanliness
✅ Light and economical
✅ Effective protective film
✅ Simple application

Disadvantages

❌ None

The first impression

Packaging and contents

ℹ️ Here we take a closer look at packaging. Sustainability is becoming an increasingly important factor. In addition, adequate protection of the product must of course also be guaranteed. Are the contents of the packaging complete and does the manufacturer make it as easy as possible for me to use the product straight away?

CriterionRemarkScore achieved*
Product protectionCarton is sturdy, product sufficiently protected100 points
Sustainability PackagingCompact product packaging, no unnecessary packaging waste100 points
Package contents & scopeComplete, additional sponge included100 points
Instructions for useProduct self-explanatory100 points
Total100 points
Weighting: 20%
*The maximum score is 100 points

KaiserRein glass cleaner concentrate proves to be an all-round convincing solution for glass cleaning. It is not only characterised by its exceptional cleaning performance, but also offers exemplary product protection and sustainable packaging options. The carton in which the product is securely packaged is impressively sturdy, ensuring that the KaiserRein glass cleaner concentrate is optimally protected during transport . This ensures that it reaches the consumer in perfect condition . The emphasis on sustainability in terms of product packaging is particularly pleasing. KaiserRein has opted for extremely compact and efficient packaging without compromising on product protection . Unnecessary packaging waste has been deliberately avoided, which not only makes ecological sense , but also economic sense. The package contents and scope of the KaiserRein glass cleaner concentrate are complete and fully fulfil consumer expectations. This ensures that the product can be used without restriction and does not contain any unpleasant surprises. To summarise, KaiserRein Glass Cleaner Conc entrate not only impresses with its impressive performance, but also delivers outstanding results in terms of product protection and sustainability. KaiserRein therefore offers a first-class choice for all those who not only appreciate sparkling clean glass surfaces , but also favour environmentally friendly packaging options.

The first time in your hand

Product processing and appearance

ℹ️ Before we start the practical test, we take a close look at the workmanship of the products. How high quality are the materials used? Are the look and feel satisfactory?

CriterionRemarkPoints achieved*
Visual appearanceappealing design100 points
ProcessingVery good workmanship100 points
Sustainability of the productLong application thanks to concentrate80 points
Total93 points
Weighting: 20%
*The maximum score is 100 points

The glass cleaner concentrate from KaiserRein not only impresses with its attractive design, which leaves a lasting impression, but is also characterised by its excellent workmanship. The high-quality workmanship ensures a long service life and maximum efficiency. It sits securely in the hand during use, enabling effortless and reliable cleaning. To summarise, the glass cleaner concentrate from KaiserRein is an outstanding solution for glass cleaning. Its design, workmanship, stability and sustainability make it the ideal choice for anyone who demands the highest standards of cleanliness and quality. With this concentrate, you can achieve streak-free cleanliness.

This is what our practical test showed

Does the manufacturer keep its advertising promises?

ℹ️ Our practical test has the highest relevance and therefore weighting. Here, the product has to undergo a wide range of criteria and tests. We check the functions and product promises of the test article.

CriterionRemarkPoints achieved*
Performance capabilityEffective stain removal100 points
User friendlinessEasy to use100 points
OdourVery pleasant100 points
Gloss and streak-freeFlawless100 points
DilutionVery economical100 points
Total100 points
Weighting: 45%
*The maximum score is 100 points

KaiserRein Glass Cleaner Concentrate impressed in various categories in our comprehensive practical test. The performance of this product was particularly evident in the extremely effective stain removal on glass surfaces. Even stubborn stains were no problem for this glass cleaner concentrate. User-friendliness is another plus point, as the concentrate is simple and straightforward to use . Both professional users and private households can benefit from this product. The glass cleaner also exudes an extremely pleasant odour, which makes cleaning a positive experience. After use, the glass surfaces shine with a flawless lustre, without streaks or smears. The glass cleaner concentrate from KaiserRein is also extremely economical, as it can be easily diluted to obtain an optimum cleaning solution. This not only contributes to efficiency, but also to the cost-effectiveness of the product. Overall, KaiserRein Glass Cleaner Conc entrate impresses with its outstanding performance, user-friendliness and yield, while the pleasant odour and streak-free cleaning ensure an all-round satisfactory result.

Price/performance ratio

and ratings from consumers

ℹ️ Finally, we analyse how the product compares to the competition. Can it keep up with the competition in terms of price and quality? Would we generally recommend buying it? We also look at the consumer reviews and check whether the critical and positive reviews are actually justified.

CriterionRemarkScore achieved*
Price / performance ratioVery good performance in the mid-price segment80 points
Rating cutNot rated, as there are still too few customer reviews
Total80 points
Weighting: 15%
*The maximum score is 100 points

Prices of up to €29.90 per litre are charged on the Internet for equivalent products. Very cheap products are available from as little as €8.28 per litre . The glass cleaner concentrate from KaiserRein is therefore currently in the middle price segment with a price of €18.99 per litre. For the quality and performance received, the price-performance ratio is good.

Overall result

WeightingScore achieved*
1. packaging & contents20%100 points
2. product processing & appearance20%93 points
3. in the practical test45%100 points
4. price/performance & consumer reviews15%80 points
Total96 points
*The maximum score is 100 points
Glass cleaner concentrate
 of the brand 
KaiserRein
achieved
96
Points in our test and therefore passed. The test was carried out in the test period
11/23
and is stored in our database under the licence number
231019008
. Further information on our test procedure can be found at www.pruefengel.de/testverfahren.

The practical tests are based on careful observations and do not include long-term or laboratory tests. The test judgements reflect the personal impressions and opinions of the testers who try out the products in everyday use. We would like to emphasise that these evaluations do not claim to be exhaustive and may reflect both subjective and objective impressions. The evaluations are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a serious and thorough testing procedure, which has been developed in a long and professional process in close co-operation with our testers.

The practical tests are based on careful observations and do not include long-term or laboratory tests. The test judgements reflect the personal impressions and opinions of the testers who try out the products in everyday use. We would like to emphasise that these evaluations do not claim to be exhaustive and may reflect both subjective and objective impressions. The evaluations are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a serious and thorough testing procedure, which has been developed in a long and professional process in close co-operation with our testers.

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Evaluation process

You can find a detailed insight into our evaluation process, which forms the basis for our product ratings, here:

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