Yes, there is. But here common sense should be applied. If a pressure washer is an industrial unit that lifts paint from metal and punches holes in timber, I would be anxious to use it on relatively thin plastic. Also, I would take into account how much do I know about what to expect from my PW at certain distances and settings.
To clean it from all wax would be nice, but hardly achievable.
By the way, @AdamMaskew posted his results here.