Black stains on seals around windows

#1
I have a 2001 alfa gold 5th wheel with black stains on all exterior rubber seals around windows and doors.
I have tried mold and milsew cleaners,bleach,oxyclean, all with no luck.
If anyone has any ideas please let me know.

Thanks, John.
 
#3
Black stains on seals around windows

I presume you have tried Black Streak Remover??? Get it at Wal-Mart or any RV shop....works great.
 
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