that plastic renew is crap.......
When you get the product only then do you see how useless it is.
You cant use detergent, cant spill fuel on it, when it looses its lustre you have to re apply.
You might as well use Armour all or the Motal silicon spray.
I watched some interesting youtube ways & used the scrape, sand 400 wet'n'dry, wipe & heat gun ... yes & this worked, its alot of work, but for my 87 KX500 & 86 CR500 theres no alternative. (new plastics-i wish)
Just my 10cents worth
http://www.youtube.com/watch?v=KJb5IPOx2l0