Imho try to heat ~ 170 C (eg, by solder iron) if gets softened or melts it's ethylene-vinyl acetate (EVA), ethylene-methyl acrylate (EMA). polyesters, polyethylene/polyamide, or polyolefin, combination of which is being a hot glue constituent
if not it could be epoxy resin (not siliconized one as no white color), then rub the areas to be removed with a clean, soft cloth dampened with high(est) concentrate acetone, keep the acetone in contact with that area unless it's surely parted