Sonax Gloss Shampoo came highly recommended by Larry Reynolds at Car Care Specialties(CCS). I mean in their opinion, at that time, it was their favorite although now it's a co-favorite with P21S. I bought a bottle of it a couple of years ago along with my usual yearly supply of P21S. At first it did seem to leave the surface a little glossier than P21S, but no slicker. I used it off and on throughout the summer to give Sonax a fair evaluation. After 4 or 5 months of use I decided my initial impression was based more on the build-up made by CCS than reality. I like the flip-top spout although I never used the measuring cup on the bottom of the bottle. It is a really great shampoo and if I couldn't get P21S I'd use it instead, but I can so I do, except .... I've been converted to Gold Class.
