Wash first, then clay, then wash again then polish. The results when you prep right are phenominal. I like Zaino products. I use their clay. I have seen different grades of clay but would be wary of them because it is telling me that they have grit in them. On a dark car the shine looks incredibly deep. the other thing I like about Zaino is it lasts. Go onto their site zainobros.com and read about the tests they have done.