Hi Rich,
Have previously posted this on the internet,but was ignored. Try this it works. Go to Wall Mart,& buy a bottle of Turtle Wax in a Green Plastic bottle Marked Scratch,& swirl,in the automotive department. IT is white,& creamy. It is used on Automotive Plastic Head light lenses to clear them up,& works wonders on scuffed clear, red,or Blue caps. Take a small bit a rub with a soft rag,,or Napkin, in circles,using a bit of pressure,& then wipe clean,will remove any scuff marks,but will not take out gouges in the Plastic,but works Majority of the time.,& only takes a few Minutes. Can Make them look new again. What can you lose,it is only about $3.00,and lasts a life time? The ones that you cannot clean enough,swap with your returns,at no cost.....
John
Ps,works on the smaller one too...