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sixgun,

Do you mean the vapors of those chemicals will harm the scales or is it necessary to get liquids on the scales to cause harm? And are you referring to all the chemicals I mentioned?
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I agree with Kap 0 on the mineral spirits, it's a great, tame solvent, naphtha (lighter fluid) works well too, but evaporates much faster. Acetone is also a great solvent, but must be watched around...