I knew you didn't use str. D.

Yes make your soap mix stronger with the D. but becareful.

The stain your talking about is a tough one,its been on there to long and has set in the paint.I've seem that ghost like stain so bad it takes a rubbing compound to remove.Alot of times it can be done your way but will take several washing to do so.

Would suggest on bid:=first time wash at $$ then $ after.
Also do your bookwork before you go:= is the maintenance personal paid by hr. or ? (talk to these guys find out,p/w maintenace,chemical cost and how long they spend on each bus).,,,You will have a better chance in getting the account if you go before the school board.As your explaining to them,throw in how much safer a clean bus would be ever chance you get and ask them to agree with you each time.
Will email ya on other chemical,dang it.

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