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To remove mold and mildew from your canvas tent, or awning, first vacuum or brush soilded areas to remove any excess dirt. Wash the affected area with a solution of 1/2 cup Lysol to a gallon of hot water. Rinse with a solution of 1 cup lemon juice and 1 cup salt to a gallon of hot water. Allow the canvas to air dry in the sun.
You can also try applying a cleaner such as IOSSO Tent & Camping Gear Cleaner. This cleaner is made to remove tough dirt and mildew stains. Afterwards, you may want to treat the canvas with a water-repellent compound such as Canvak.
Followed this to the letter on my popup: a lot of elbow grease but virtually no results. Maybe the mildew was too far advanced?
Thank you. We left our boat cover off for a beautiful dry spell this summer. It was left in a spot where the sprinkling system reached it every morning. After 10 days it was a mess. Next spring I am going to try this. Thank you for the tip.