Waxed canvas is suppose to give that rugged look and it's unavoidable that your bag will encounter dirt. If you wish a cleaner look, just follow these few steps. Liquid castille soap is the best for this type of cleaning, but if that's not available, mild face or body soap can be an alternative cleaning agent. Avoid harsh detergent or anything that has bleach.

Water marks and crease marks are normal for waxed canvas but if you want a more polish look, just click on the video

Avoid storing your bag in a damp and humid environment to avoid mildew growth but if this already happened to your bag, just follow this video and your bag will be good as new. We used vinegar in this video but you can also use hydrogen peroxide. Dampen cloth with hydrogen peroxide and pat the cloth on affected areas. Air dry or blow dry. Repeat the process if necessary.