Can you fix scratches in Little Tykes furniture?
Buffing followed by acid etch (to restore texture).  Overall a pretty rough job.  You'll want to check the plastic type (found next to a 'recycling' symbol usually) for additional guidance.  LDPE is common.  Some people use heat guns, but for maximum potential entertainment value why not try a blowtorch?  LDPE is actually pretty hard to set on fire.