cleaning help

[djcs0302]

I have a customer that has a 7x16 enclosed cargo south trailer. It has been sitting outside under an oak tree for the last couple of years unused. He now has a cabinet business and wants to get it lettered but it has like a oxidized look to it. He wants it cleaned and the question is, what would be best to clean this? He said he has tried to pressure wash it off with no luck. Will heat do the trick? what chemical would suit this job? Please help.

[We Wash Concrete]

I've seen cleaners specialized to clean trailers like that sold at Tractor Supply Company and Northern, I would start with those.

[Paul Kassander]

If the paint rubs off on your hand when you wipe it the trailer is oxidized and can be cleaned with several differnt types of cleaners. If it is stained in the paint you may have to buff the surface with a polishing compound to remove the stain (and a small layer of paint). Z greaser would probably do the job or limonene might work well too.