I wash my towels on HOT with Tide Free with only the towels that are for the car. I have enough to do a couple washes with, so I wash them every other week. During the rinse cycle I put in a cap full of distilled white vinegar per towel to act as a non-silicone based fabric softener. Afterwards, they are taken out, folded and left to air dry, then put back in my detailing tub/box to keep them from getting dusty.
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