Remember to scrub with the grooves of the sole instead of against them, to avoid damaging your shoe. [2] X Research source

Keep going until the gum is more or less completely removed. This may take a little while, but it’s better to act quickly instead of allowing the gum to dry and harden onto your shoe.

Make sure to use the naphtha in a well-ventilated area, away from any heat sources, as naphtha is highly flammable.

Just be careful what type of shoes you use this method for, as acetone may damage the finish on patent or suede shoes. [3] X Research source