Most of the mold cleans up with vinegar and bleach mix. Is there some preservative that I can apply to the canvas after I remove the mold that will keep it from remolding for next year? Maybe a 3M product or something like that?
Jane, Dollar General is not in our state, nor the surrounding ones close by. I see this Awesome stuff can be bought on the internet and is a citrus cleaner. Perhaps if I mix citrus with vinegar, I can make a cleaner that is effective on the canves more.

But I still want to be able to slow the process of it returning later!