That brings up another issue of what detergents/soaps/cleaning agents to use to get "dirty" microfiber clothes REALLY clean.
I have been using Super Clean (formerly Castrol) the Purple Stuff, cleaner-degreaser to wash my clothes in and then do a double-rinse and add white vinegar to the last rinse cycle.
Granted, you wouldn't get out "stains' like tar and some paint pigments (from single-stage paints), or exhaust tip carbon, but it does a good job on waxes and polishes. I've used Super Clean to clean polishing pads and if it works on them, it seems to work on microfiber clothes.
I have not used a dedicated microfiber cleaning/wash soap, so I cannot comment if that is the way to go or not. I used to use Tide with Dawn, but P&G (Procter-and-Gamble) does not make that anymore.
What ever happen to Charlie's Soaps that were all the rage some years ago, both their All-Purpose Cleaner and detergent??