Melting Hydraulic Fluid And Mud Off Scrap Trailers

So I’ve got my 2 stepping on trucks and trailers down pat, but I’m still struggling with the black scrap trailers. They haul scrapped cars and so are coated and caked with oil and hydraulic fluid and mud. It’s so bad a turbo nozzle won’t even get it all of and it takes at least an hour to get it even partially clean. Anyone have experience with these? I have a 12v system so I’d like to be able to just spray on something like a degreaser that would just melt everything and let me rinse it right off. Is that even in the realm of possibility and if so what should I use?

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Are you scrubbing the oil also?

R202
R111
R109
Pink thunder

Nah it’d be like scrubbing a pile of dirt lol. I guess it’s not really oil. I don’t know what it is. I can get oil off of the trucks easily with heat, but these trailers are just caked in a near-cement like kind of dirt and mud. I’m going to call a few local chem places and see if I can get a 55 gal of some degreaser or concrete eater

I don’t do fleet work but I’ve used a product from a Hotsy dealer called EZ Melt. I’ve used it to remove asphalt and paint from concrete. It also says it’s good for tar. Apparently it’s safe to use on vehicles, so that may be an option to look into.

I think it might be fly ash. I have the same problem on some of the trucks I do. The spread ash down to dry the road so machines n trucks won’t rut it up and get stuck