So in my brew I am making a blueberry beer and added blueberries to the primary by putting them in a fine strainer bag. I left the bag in for the 5 days the beer was in the primary and just racked to the secondary. I took out the strainer bag, tossed the spent blueberries and tried to clean the bag, but some stain still remains. It looked pretty yellow so I tried washing it by hand a few times, then boiled it for 20 or so minutes and a lot of the color came out but its still not pure white anymore. Im just wondering if it would be safe to use again. I know it would be fine for pre-boil but what about for leaving in wort again? This is a relatively minor issue cause we are only talking about a few dollars but it is all the little things that add up quickly.