Take the rug outside and shake out loose dirt and debris
Vacuum both sides thoroughly
Sprinkle baking soda generously over the rug
Let it sit for several hours or overnight
Vacuum the baking soda completely
Mix equal parts white vinegar and water in a spray bottle
Lightly mist the affected areas without soaking the rug
Blot with clean towels
Repeat if needed
Place the rug in direct sunlight if possible
Use a fan or dehumidifier to speed drying
Ensure the rug is completely dry before bringing it back inside
Wash the rug according to the care label if it is machine washable
Use an enzyme cleaner for persistent mildew odor
Replace the rug padding if it smells musty
Store the rug only when fully clean and dry