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Black Gunky Stuff On Scrim, Think It's Rubber From Window?

buzzing

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Happened again today and I remember it happening before. When I was doing the detailing with my scrim or frames with sill cloth, this horrible black stuff got on my scrim it spread on the frames as well, will it ruin my scrim? I just put it in for a hot wash. I think it might be off the rubber between the glass and frames, but not 100%.

 
I get it all the time, only for first couple of cleans though and first clean is worst. It does come off though it's only oxidisation on seals (so I'm told).

 
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