We need a hint from Heloise here "How to remove soot-contaminated oil from Diesel engines from fabric and other places.

I have found Go-Jo works well on skin and rubber, but fabric seems to have a strong affinity for SDLO (Sooty Diesel Lubricating Oil). I change my own oil, you see, and somehow, somewhere between the drain pan and the detergent jugs I take it away with, a minute quantity of this nasty stuff always seems to get where I doi not wish it to go.

Degreaser will change a black spot to an unfashionable shade of gray spot, but will not cause it to disappear completely.

Perhaps I need some enzyme-type cleaner that contains petroleum eating microbes.

I have tried the topsider but it is painfully slow.

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Semibodacious Transmogrifications a Specialty

1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)

"Time flies like and arrow, yet fruit flies like a banana"
---Marx (Groucho)