Cloth, canvas, and plastic grocery bags are a great improvement over paper bags in terms of cutting down on our use of natural resources. But they do get grimy and crumb-filled after awhile. Take a moment to clean them up. Some you can just throw in the washing machine–though best to put them in a mesh bag so the handles don’t get caught in the machine. Otherwise, for canvas and cloth bags, wash with a little laundry soap in the sink. Plastic bags, use a cloth or sponge in soapy water to wipe down, then rinse.
This great idea comes from https://www.goodhousekeeping.com/home/cleaning/g3345/spring-cleaning-tips/?slide=5, which is filled with other good cleaning tips.