Grey water system conundrum
Having an issue with slow/no running drains while doing de-winterization on my 28 FCRBQ. The shower drain doesn't move, and the sink drain goes very slowly. If I open the grey drain valve, the sink and shower drain. I'm thinking this is likely a clogged vent. I took the cover off of the top of the outside vent, but there is a screen built into it that doesn't want to come off, so I can't snake it or really get a hose to it. Pic of vent attached.
Any thoughts on how to progress?
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