Sorry I'm having trouble opening all threads on the new board and I did answer your post but it would not post to the board,this one may not post either.
Like I said before it takes two different chemicals one being applied over the other.It can be two different kinds of soap one being applied over the other or it can be a acid and a soap applied the same way.Several different ways to apply,downstreamer,flo-jets and even pumpup sprayers are used.Call your supplier for help in which chemicals to use,a soap applied over acid is the best cleaner as to a 2-step soap applied over another soap.
It doesn't matter if you have one or 10 washers pulling from one or 100 tanks its still applied the same way.I like appling the acid with a downstreamer b/c of better control under low psi,I also like useing upstream soap to apply the soap under high psi.
Call Mark he can get the acid for you and give you more info on how.
When I see people washing in cut off pants and appling fleet soaps haven't read the labels as in protection.Any chemical that has the power to brighten isn't good on bare skin.