To get mold and mildew off an inflatable kayak, use a mixture of equal parts of water and distilled white vinegar or a mild bleach-water solution.  The acidic nature of vinegar works well to break down mold without damaging the kayak’s material.  Be sure to rinse thoroughly and let the kayak dry afterward.  It’s important to remember: prevention is better than cure. By ensuring your kayak is properly dried after each use and stored in a well-ventilated area, you can significantly reduce the risk of mold growth.