Things You Will Need
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Fill a tub, bucket or wash basin with warm water. Add mild liquid detergent, using the amount the bottle recommends for a small load.
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Wash the flag gently in the sudsy water. Rinse the flag thoroughly in clean water.
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Squeeze the excess water gently out of the flag. Spread the flag on top of one or two large towels, depending on the size of your flag. Roll the flag and the towel up together, squeezing gently to get the towels to absorb the water from the flag.
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Hang the damp flag on a clothesline to air-dry. If you're going to store the flag, make sure it is completely dry before you fold it up. Damp flags can become mildewed, and folding a damp flag can leave permanent creases.