I am new at this bbs biz,so I'll try again.I am wondering if any one has any recommendations on chemicals,and wash process for these railcars.I have a good idea of process,but not so sure of chemicles.The cars are painted like an auto,and I would like a spot free rinse to go along.They are not heavily soiled,regular environmental grime,mixed in with a touch of diesel soot.Hep me please.Thanks.