i've branched out into commercial detailing. a repeat customer has a 40 foot (+/-) grain trailer he needs washed and degreased. it has stainless steel railings, but since i wont be polishing them, will an APC give them a good enough cleaning or does any1 have other ideas/ chemicals they know work?

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A couple of things... from a guy that's worked on a grain farm, Farmers don't really care about "pretty", they care about ROI, or Return on their investment. They'll spend more for anything that won't rust versus spend less for something that in a few years they'll have to replace because it rusted to the point it needs to be replaced.
The point being unless this farmer is completely different than all the rest, just focus on getting it clean but not polished all pretty.
A good all purpose cleaner and a stout brush on an extendible and
strong handle should get the job done, a mop was suggested, I would look more for some kind of "Scotchbrite" mop and I think you can get these for cleaning floors, the green, aggressive Scotchbrite material together with an all purpose cleaner should remove that built up grunge pretty well.
Check out a Janitorial Supply Store, they usually care a good selection of brush and mop heads and heavy duty handles.
DP Cleanse-All Exterior Cleaner is a strong but safe all purpose cleaner that has tackled everything I've used it on.
DP Cleanse-All Exterior Cleaner
I keep bottles of it in the Studio always ready to go.
