Soap and hot water won't work. WD40 wont work,. Picking at it won't work.
Is Acetone/paint thinner a bad idea?

Nail polish remover? (would have to go to the store for that).

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E