Gunk definitions

gŭngk
A thick greasy substance.
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Any oily, viscous, or thick, messy substance.
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(uncountable, informal) Dirt or grime; any vague or unknown substance.

I washed all the gunk off the light fixture, and found that it was white, not brown.

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(uncountable) A subculture of 21st century American males, combining elements of modern gothic culture with punk rock.
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(countable) A member of the gunk subculture.
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Origin of gunk

After Gunk , a trademark for a degreasing solvent