Polypropylene fabrics can be sanitized with a 70% isopropyl alcoholic solution. Adding baking soda and vinegar to the washing machine when doing laundry have will remove any bacteria from the fabric. Put 120g of baking soda added to the washing process will brighten the colours and soften hard water. Adding 240ml of vinegar during the rinse cycle will soften the fabric and remove any odour. Polypropylene fabrics resist mildew growth, however, mildew may grow on dirt and other substances if not removed from the fabric. In such case you can: 1. Prepare a solution of bleach (maximum 5% per 1l of water) and mild soap (use of bleach may impact the deterioration of the sewing thread and other elements of the ready-made product) 2. Spray on the entire area and allow to soak into the fabric for 15min 3. Clean the entire surface with a sponge, clean towel or a very soft bristle brush 4. Rinse thoroughly to remove all soap residue 5. Allow the fabric to dry naturally.