Nutball
TreeHouser
If I had an affordable source of Ethanol only, I might try running a saw on it for a while. The chemicals they have in gasoline can expand and degrade some rubber or plastic materials, and it can leave behind gel after evaporating. Ethanol (alcohol) as far as I know is much less harmful to rubber and plastic, and evaporates without leaving behind any residue other than the water it absorbed. I think the water is the main concern with ethanol.