Cheers chaps.
Okay, sounds good Rob, I've tried bleach in the past but nothing quite as hefty as the stuff you're talking about.

Yeah it's pretty hefty. If you spray it on your ceiling and don't open any windows, you'll die in 5 minutes Your method seems to be safer, I might give that a try.

Nice one Pure! I used to dremel a shit ton when I was younger, carving illustrations into glass bottles and such. Pretty cool method... don't have a dremel these days though... nor are any of my supes' shells damaged... but will definitely keep that trick in mind!