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Dan S. MacAbre[_4_]

wrote:
I have pillowcases with unknown stains on, they look like maybe oil, with just slight darkening, but standard washing doesn't touch them. There's no way to find out what's on them. Any ideas as to how to proceed? It'll be at least a day before I can rewash them.

NT

Are the pillowcases plain white? Are they cotton, or synthetic? Are
you going to throw them away if you can't get rid of the stain? :-)

I usually try methanol, acetone, or bleach. Or sometimes, a sort of
chromatography - dripping water or solvent to make a stain sort of
migrate until it's too faint to see. One of them will usually work, but
it depends very much on what you're working with - you could end up
destroying them.