Question about cleaning rubber window trim

[Eldorado2k]

When cleaning the rubber trim on the exterior of the windows.. Is it normal for there to be never ending black soot coming off on my towel? Should 1 continue until there's no more black coming off? Or am I destroying the rubber? Stupid question, I know, but I had to ask.

[expdetailing]

It's a lot like cleaning your wiper blades; the black transfer will never end. Two passes should be thorough enough.

[Eldorado2k]

Thanks.

[Eldorado2k]

All cleaned & coated.

This is what they looked like before:

40443

After:

40444