I bake and decorate cakes, as a second income, and use washable bags for my frosting. Over time, the bags seem to develop an odor of stale shortening, which I can't seem to get rid of. The bags are not cheap, so I can't keep replacing them, and the odor doesn't seem to transfer over to the cake I am working on, but it just bothers me that I can't get rid of the odor.
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After you have washed your bags try soaking them overnight in some white distilled vinegar, the acid from the vinegar will usually dissolve the odor but after you use this technique you will have to rinse the bags again thoroughly. You may even decide to use water with it instead of the vinegar by itself it's really up to you.
What about making a paste of baking soda and water and rubbing the inside and outside with this paste and letting it sit for a while and then washing them.
I haven't tried this but it sounds like it would work. After your bag is clean, line your expensive bag with a freezer zip bag filling both bags and cutting off the tip of the plastic bag, and use your tip. This way if any icing gets on it would only be a small amount near the tip.
I would try a small amount of bleach in a sink full of water, overnight. I don't think the bleach would harm the bags in any way, since bleach is what is added to our drinking water, to clean & purify it.
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