Impure1NZ

In some cases, the yellow tinge is nothing but accumulated road grime, so a good degreaser or the likes could do the trick, too

Anyone know if there would be any isues (or benefits) from changing plugs with .8 gap?

I'll also be interested in hearing how this goes. I've been using Meguiar's PlastX - works well enough, though my driver's side headlight still has a very faint tinge to it. But at least I can actually see into them now, so bonus!