I did a job I had to go back and do again on nearly all of the insides a few years a go using that stuff gg3,it's no different to gg4 just a bit more froth but not a lot more that it's worth mentioning really. On doing them they looked perfect but when I went back and had to do them again they looked dreadful TBH,there were squeegee drag lines and direction changes galore one of the worst jobs I can say I've ever done traditionally. The result your looking for using this product can be made by using minimal ordinary detergent,the amount of say fairy liquid or similar window cleaners use is far to much in a bucket for traditional cleaning you literally just need a teaspoon full in a bucket of water. I reckon if I wanted to I could make a bottle of fairy last me near on a year these days with the amount of blading I do,mostly shops and insides.