Tarps protect the interiors of pools, surfaces of vehicles and other items from precipitation, dirt and debris. When rainwater or other liquids rest on a tarp for a long time, however, mold spots can appear. The mold spots transfer onto other items and also cause a noticeably foul smell. Replacing the tarp is not your only option. A natural household cleaner can remove the mold spores and all of the bad smells without staining or eating through the tarp.
Take the tarp outside to your lawn or garage. Open the tarp fully so you are able to see all of the mold spots.
Spray the portions of the tarp covered in mold with a high-powered hose. Scrub any mold spots you still see off the tarp, using a soft-bristle brush.
Mix ¼ cup of baking soda and a few cups of white vinegar inside the spray bottle.
Spray all the moldy parts of the tarp with the solution. Leave the solution on the tarp for approximately 15 minutes.
Saturate a different brush with water. Scrub the tarp again with the clean brush.
Repeat Step 2 to rinse the tarp.
Hang the tarp outside in a sunny part of the yard until it completely dries. The sunlight and warmth prevents any reappearance of mold or foul odors on the tarp.