Cleaning rubber seals

[scottvd]

First 1Z Einszett 924410 Plastic Deep Cleaner is awesome! Spray it on what you think is a clean surface, wipe it down with a white towel and you'll see how nasty it was. Amazing stuff, great smell too.

So seriously, does there ever come a day when you wipe down the black rubber seals and they DON'T get your towel all dirty black? Am I removing 10 years of gunk or is what what I can expect from this point forward? Hate getting my towels all nasty.