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prewashing
verb
1. Present participle of prewash.
example
2. I bought some blank tyvek tarp on ebay to make covers for my serger/sewing machines long/light so I don't have to lower the thread thingys as with regular covers I didn't think about prewashing.
example
3. (And some say that either prewashing the yarn before knitting or washing after knitted softens it up.)