Product overview

Welcome to New Zealand’s trusted, independent source of practical consumer information. Join us now to access all our information and Consumer advisers when you need them.  

Window and glass cleaners

16feb window and glass cleaners hero default

There’s nothing like a clean window.

We used a mechanical arm with a damp sponge to assess how well each window and glass cleaner removed a greasy soil stain. Find out which were the clear winners.

From our test

Join us now for instant access

Join more than 100,000 members today and you’ll get:

  • Independent info
  • Thousands of test results and research you can trust
  • Everything in one easy place
  • Expert support a phone call away if things go wrong

About our test

Our test assessed how well a cleaner removed a greasy soil stain.

We applied greasy soil, which consists of peanut oil, kaolin clay and black carbon, to a window. Each cleaner was then applied to the sheet and using a mechanical arm with a damp sponge, the sheet was scrubbed 10 times. We then used a spectrophotometer to measure how much light was reflected compared to before the greasy soil was applied. This assessed how well the cleaner cleaned.

Not for use on all surfaces

Window and glass cleaners often contain ammonia, which can damage surfaces that aren’t glass or properly sealed.

The Glitz, Earthwise and Simple Green cleaners claim to be free of ammonia. Our vinegar and water recipe is ammonia-free.

There are some surfaces where you shouldn’t use window or glass cleaners, unless the cleaner states it is safe to use. These are LCD and plasma screens such as TVs, computer screens and mobile phone screens. Window and glass cleaners generally shouldn’t be used on painted and unpainted wood, cooking utensils, plates, upholstery and carpet, acrylic, fibreglass, waxed, polished or lacquered surfaces, or electrical outlets. Always read the bottle first.

For tackling a variety of stains, check out our multi-purpose cleaners test.

Safety first

Always keep your cleaners away from children — ideally in a high or locked cupboard.

If anyone swallows cleaning product, immediately rinse out their mouth with water and phone your doctor or the National Poisons Centre (0800 POISON).