Was doing my tires with my sponge and turtle wax black in a flash, and I noticed the wipers 'end' and how deteriorated they looked. So I wiped them with the sponge but it was hot and sunny, the second I put it on it looked like it evaporated and the light grey came back immediately. But to my surprise after a week I noticed that 'black in a flash' really did an amazing job in restoring the plastic. The light grey parts are the parts I didn't bother with as I thought it wasn't working. So credit where it's due, a nice case of it does what it says on the bottle. Now I'm thinking attacking all the rubber around the windows and all other plastic/rubber parts. It used to look so bad that I was considering replacing or painting.