sandpaper....?

Don't get the bosch platinum +4's I had them. They suck. just get OEM replacement NGK's. Trust me. The idea of the platinum +4's is skewed. You've got four points competing for one spark, and a little bit of the spark ends up going to more than one point = weaker spark. In addition, there's no gapping those... they're all pregapped.

My car runs much better when I put NGK's back in my car.

do youself and you wallet a favor. Go with the OEM NGK's