Paul O. says...

Instructions say to use a non flammable tar and pitch remover. How bout
denatured alcohol, or something else I may have around. Thanks.

How about a detergent like a really strong citrus cleaner? Acetone and
denatured alcohol are both very flammable. Acetone is murder on most
plastics. If you aren't worried about the flammable part, VM&P naphtha
is a better universal organic solvent than either alcohol or acetone and
it is reasonably safe for most plastics. Naphtha will also sweep away
any oil and grease residue which acetone and alcohol aren't very good at
dissolving. Naphtha will evaporate almost as quickly as acetone.