They are lying.I may have misspelled the name Klean Strip, but they offer stripper for plastic parts.
http://www.autobodytoolmart.com/klea...7-p-12820.aspx
Here is SEM stripper for plastics
http://www.oreillyauto.com/site/c/de...0483&ppt=C0171
You can also try this
http://www.oreillyauto.com/site/c/de...0483&ppt=C0171