back alley
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i have read that they are supposed to be cleaned by hand, no soap and air dried.
I go to the store and buy a new one. Not worth a few bucks over the course of a year...
Use the old ones as cleaners for things less sensitive than lens elements (tablet/phone screen, instruments, etc)
I throw them in the wash with the other laundry.
The above is not a good idea.
I clean them weekly in powdered Tide in the machine on a gentle cycle. Then machine dry using the damp dry cycle. They come out softer and more absorbent than the hand wash method. Liquid Yes and Woolite works well too however Purex is a better alternative if Tide is not available.
This is like a filter or no filter thread: more opinions than there are focal lengths.