Polkahero

I just purchased a used KMC 3 bluetooth speaker and while it works and sounds great, the rubber coating on the outside of the cabinet is very sticky/tacky. It picks up every little bit of dust, lint, etc. and I feel like I have to wash my hands every time I handle it. I called Klipsch and they suggest an ammonia based cleaner but I didn't have any luck with Windex so then I tried rubbing alcohol with no results. Finally, after I switched to denatured alcohol the coating started coming off which is the only way to get rid of the tackiness. So far I've removed the coating from the top and one side but as my arm/hand is killing me from so much elbow grease I was wondering if anyone here has experienced a similar issue and what they did to remedy it. Was thinking about switching to acetone but worried that will do some internal damage and possibly degrade the plastic housing, nasty stuff!