Can you tell if it is metallic or like soil? I agree it could be rust but that is normally a little redder in color from the iron oxidation. It may be a mud dauber nest that is right in the way of your drain and you are slowly washing it out. Just another thought, but your situation is not normal.
2015.5 salem 30QBSS
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- 2015.5 Salem 30QBSS Show Stopper
- Previous 1999 Skamper Lite by Thor
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