I have tried rubbing the inserts in the past with car rubbing compound this has given good results but leaves the insert looking faded but glossy bleach does give a better result but i found it hard to control sometimes leaving it a bit longer in the bleach fades it too much this time i decided to use a different method im sure this has been done many times before, lets see if anyone can guess which method i used   First i decided to do inserts that i already faded/aged to different degrees