I found an old acrylic res I bought some years ago but never used. It seems to have some "grit" on the inside walls. I've tried flushing with hot water and rinsing with vinegar but the "grit" is still there. I'm not sure what it could be since I've never used the res. It just sat on a shelf for the last couple years. I know alcohol and acrylic don't mix so what would a good choice be to clean out the inside?
Thanks in advance.
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