Unless it's a leather boot (which would ruin the leather) a hairdryer in a well ventilated space will also work. Gasoline evaporates at pretty low temperatures.
"The western world sips from a poisonous cocktail: Polarisation, populism, protectionism and post-truth"
-Antje Jackelén, Archbishop of the Church of Sweden
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-Antje Jackelén, Archbishop of the Church of Sweden