Gently wipe with soft rag and oil-based soapy water to remove visible stains or dirt. Keep bag away from high humidity as material is prone to mildew. Tougher oil or grease stains and mildew may require use of a soft bristle toothbrush. Avoid brushing too hard. After cleaning, wipe area with clean cloth to remove soap residue.
Straw bags undergo a natural oxidation process which darken the straw material. This is a natural process, but storing in a dust bag away from sunlight will delay the process.