GtechniqW2 Multi-Purpose Car Cleaner, Matchless Car Cleaning Power, Biodegradable Exterior and Interior Car Cleaner, Supreme Dirt Removal - 16.9 fl oz (500ml)Compact by Design (Amazon-developed Certification)

I have a Mercedes convertible and my roof has not really been up to scratch for a long time. Went online to buy my usual product and found that Gtechniq had been rated higher!! I bought 0.5 litres and used it "neat".....I could not believe how much "filth" flowed when I rinsed off the Cleaner. My roof is still not perfect, and as I had used the whole lot, I have ordered 5 litres and will use it 50/50 the next time.I would certainly recommend W2 for this purpose and I think it is a great product to have in your home for anything stubborn, even if you do not own a convertible :-)

Used it to clean the roof of a second hand Audi A3 Cabriolet. Did a great job and easy to use. Also has many other uses as a 'cleaner'. It might be a bit more expensive than other makes but does its job well.

I used this for my car roof. It’s potent stuff and I diluted to a 3:1 ratio which was plenty strong enough. It’s much quicker than using the Renovo cleaner I had previously. I did find it a pain to remove from glass though so be careful of overspray. I’ll be buying more and finding other things to clean! It really is great

Cleaned my roof with two applications which removed most of the moss and dirt accumulated over a year and a half. There are still stubborn patches of dirt which I am sure will be removed with another application. Great product and better value for money than another brand I have tried as there is still 3/4’s of the bottle left

The product a plastic bag with no instructions and was leaking. The seal of product was broken. For extra few quid more i bought the product plus other items from Gtechniq directly and they provide instructions and in secure package. I beileve this may not be genuine product.