Originally Posted by 328gary
It may be relabeled P21S if its from Germany.
For a good over the counter general carwash soap you might try Meguires 'Gold Class'. You should be able to a half gallon for that same $9.
Its funny you say this. I saw it the other day too and immediately thought the bottle shape resembled the P21S car shampoo I have used. I am willing to bet it is P21S.