It may depend on the gun and who makes it. I had a Specialty Tapes gun whose rollers got too much crud on it. I used naphtha (lighter fluid) – I mean, why not, it takes adhesive off of prints, right? Instead of removing the adhesive, the rollers themselves got soft and tacky and completely unusable.
I ended up having to replace the whole tool since Specialty Tapes doesn’t sell individual part replacements.
I’d try a mechanical method first before attempting chemical solvents.