it’s neither corrosive nor conductive, so it doesn’t dissolve or short anything. it also evaporates at low temperatures, so cleanup is a nonissue
candle wax shares the first 2 properties, but not the 3rd. this means letting a candle drip into your PC won’t destroy it, but requires careful cleaning as it traps heat
plastics are very choosy about what they dissolve in. Almost no plastic dissolves in IPA, so it wont mark any surface. It also evaporates quickly and doesnt leave a residue, or corrode metal, doesnt smell bad, and is non-toxic. It is better at dissolving oils and fats and other organic stuff than say ethanol (normal alcohol), and so good for cleaning. Acetone is just as good as cleaning, but more plastics are soluble in acetone, so not used. Other possible fluids (petrol, kerosene, turps etc) either smell too bad or might slightly dissolve some plastics.
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