How do you wash or clean a microfiber rag?

I know you use it to dust off the lcd and to take off smudges , but how do you clean the actual microfiber rag, or do you even have to.





Just want to know , I don't want to clean a lcd screen if the rag still has residue.How do you wash or clean a microfiber rag?
I have tons of microfiber rags. I wash them with the towels that I don't bleach. I hang dry them. The heat of the dryer isn't good for them.How do you wash or clean a microfiber rag?
You could throw it in the washer with other towels or just hand wash it with mild detergent. I put mind in washer.