Got this and it has what looks like black dry stains. I’ve read the cleaning instructions, and looking for any different/added input from experienced individuals. I rub the black with my hand, it doesn’t appear to come off but I haven’t put effort into it yet. I just don’t want to damage it more than it already might be.

I thought I’d pour a bucket of soapy water on it, let it soak a half hour on the way to a power wash place. Then use a brush if that doesn’t remove the stain.

 

It should be oil/chemical resistant. Try simple green for your soapy water solution then hit it with the power wash.

 

Looks like an oil stain... i would try a degreaser.

 

Thanks!
Maybe it's 5 year old oil stains that have dried, heh.

I'll use a brush as a last step if needed, don't want to alter/tear up/unravel/further damage a $100+ piece of fuzzy plastic. But I got it for $40 so there was a reason for that.

I've seen some of yours and they look clean enough to sleep on.

 

Try dawn or another degreaser soap. Might take a few applications.

 

Throw it away. If you MUST have something back there try a piece of plywood.

It is a truck, no?

 

Degreaser, drill brush, pressure wash. If its a 5 year old stain, dont expect miracles.

 

Drill brush? Which one?

Thanks everyone for the added input.
I'm not expecting anything dramatic, just want to see if a little effort can clean it up a bit to a more acceptable level.

 

White ones are usually softer. That's what you want so you're not tearing up the fabric.

 

Thanks guys, I'll try these and see what happens.
I have the non-concentrated light duty household SimpleGreen, I'll buy the normal concentrated stuff and make a run with that.