This is a very rough introduction, intended to disambiguate some common substances.
You can try the following solvents in sequence from weak to harsh; toxicity tends to increase with strength; you may also want to pre-test each one on the material to avoid damage:
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/ RELATIVELY MIXED composition, LESS POLAR /
1. diesel ( C8-C21, evaporates slowly, oily )
2. kerosene ( C10-C16, evaporates less slowly, oily )
3. white spirit @ mineral spirit ( C7-C12 )
4. turpentine ( from trees ... but not less toxic )
5. heavy naphtha ( upstream, C7-C12 )
6. gasoline ( C4-C12, evaporates quickly )
/ RELATIVELY UNIFORM composition, MORE POLAR ( "paint thinner" is typically a mix of these )
1. ethanol / denatured alcohol
2. IPA @ isopropanol
3. xylene @ xylol ( aromatic hydrocarbon, non-polar, less toxic )
4. acetone / "nail-polish remover" ( ketone, polar, less toxic )
5. MEK @ methyl ethyl ketone @ butanone ( ketone, boils slower than acetone, more toxic )
6. toluene @ toluol ( aromatic hydrocarbon, non-polar, more toxic )
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