text: Mix a solution of one part bleach to one part water. Spray on mold and mildew spots and gently rub. Let sit for 15 minutes and re-apply if it dries out. Rinse thoroughly. If Mold stain is still there use pure bleach. Bleach is the only thing that will kill the mold/mildew and if you don't kill the mold/mildew it will spread. If the canvas leaks in those spots afterwards apply "Camp-Dry" spray on waterproofer to reseal. It's available at your local hardware or Walmart.\nGood Luck and Happy Camping!!!!