you can try a house hold product called magic erase it worked on my moms car
Have the coating removed - It is about $20. If you take them to where you bought them, they may do it for free.
There is no "white stuff" in a silencer/muffler, unless you mean fiberglass packing. It has no use when removed.
it hurts
a quick fix on any white non painted plastic is soft scrubb. I use is on my ATV plastic to remove scraches and stains. Work and is quick
I heard that you put toothpaste on it.
You can buy a gentle abrasive from a shop which is used to remove scratches from watches and glass. Alternatively, you could use a car polish, or a toothpaste, and a lint free cloth.
Yes, but there should be no scraches
There is a device that removes scratches. Go to Lowes or Home Depot. Signed by Tannermo
well the dc can be coverd in scraches'
The long mane prevents scraches from fighting.
Buy a disc cleaner set they sell them in walmart.
If they aren't severe, try Meguiar's Plastic Glaze.