it varies
marsh998,
Cleaners vary from surface to surface.12% chlorine works for(kills mildew,mold and algae) roofs,vinyl siding,brightening concrete.Sodium hydroxide base cleaners are used for degreasing,stripping decks.Oxalic acid is used for neutralizing sodium hydroxide,brightening concrete.These are just a few chems we use,there are too many uses for each to list.There is a whole seperate group of cleaners used for fleetwashing.
try doing a search for some of the chem names and you'll see what I mean.Good Luck.