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Well I would otherwise you are just going to heat the Vaseline. As far as filing goes, I rub my shoes soles outdoors on rough concrete to create enough heat to soften the rubber. What I noticed also that when I'm disinfecting my shoes soles with cavi wipes, they become sticky. Warning though, cavi wipes are also corrosive so trend carefully as not to ruin the shoe.Filing like, with sandpaper or something? I think im gonna try that hair dryer thing first, you think i should remove that coat of vaseline before i expose the shoe to heat?