I mixed some of that creme developer with a little bit of Oxy White laundry powder (dissolved in some hot water first) then brushed it on this A500 case and left it outside for a few hours:
http://www.amiga.org/gallery/index.php?n=3201
DO you have the exact name of the creme developer ?, I have a Priceline on the high street of my suburb and would not mind picking some up.
Does it work on keys ? or is there a Priceline product that has more concentration of H2O2 in liquid that I can put the keys in, over and above the usual 3% bottles.