Our expert testers
We buy window cleaners available from major supermarkets and use our laboratory for testing them. We also work out value for money of each product by unit value per 100mL.
We also include a home remedy in our testing. Our home test is made up of 1 cup white vinegar and 1 cup of water.
How we choose what we test
With a range of products on the market, what makes us choose one window cleaner to test over another? As with most of our product testing, our aim is to test the most brands on the market and what you're most likely to see in stores.
We check in-store to see what's available and survey manufacturers to find out about their range of products. From this information we put together a final list that goes to our buyers. They then head out to the retailers and purchase each product, just as a normal consumer would. We do this so we can be sure they're the same as any consumer would find them and not 'tweaked' in any way.
How we test
Lab experts put each window cleaner to the test by soiling a PVC sheet with greasy dirt. The soil is able to hold more strongly onto the PVC and allows for better separation of product performance, which is why it is used instead of glass. PVC is also much thinner than glass, which is important when measuring the soil removal with the spectrophotometer. Using a scrubbing apparatus attached, the sheet is scrubbed. The reflectance readings are measured before and after cleaning to determine the overall score which is a measure of dirt removal.
Test criteria explained
Dirt removal accounts for 100% of the overall score.
Ready to buy?
Take a look at our window cleaner reviews for full test results.