If you have a boating supply store in the area, see them. This type of mold/mildew is common on marine interior vinyl. Years ago, I bought a spray from a supply house like that and it was specifically for vinyl. Sprayed it on, waited a few minutes, wiped it off. Like it was never there. Sorry, I don't remember the name but again, quite common in marine situations. Should clean up. Then do something to keep the air moving and collect the moisture.
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