Another tip is to use white (not apple) vinegar to the rinse cycle to act as a natural fabric softener. I usually do a double rinse and add the vinegar to the first rinse cycle directly into the tub (IE, do NOT use the fabric softener or bleach dispenser reservoir). how much depends on the size of the load. 1/2 cup (4 fl.oz.) for a small load; 1 cup (8 fl.oz.) for a large load. (based on a 3-1/2 cubic foot capacity top-load washer, so if you have a much larger-capacity washer and can stuff more microfibers in it, you can adjust that amount accordingly)
Also, watch for anti-static dryer sheets left behind from previous clothes drying cycles. These, even when used, will leave residue on your microfiber cloths/towels that will reek havoc on microfiber material. I have even taken the extreme measure to write with a marker pen in bold fonts "DO NOT USE WITH MICROFIBERS" warning on dryer sheet boxes and fabric softeners to prevent "accidental" (AKA ignorant) use by "others" (AKA,family members) who may think they are doing you a good deed by washing and drying your filthy car cleaning/detailing microfiber towels.
If you are looking for a good OTC (over-the-counter) detergent to try in your washer for cleaning microfibers, buy some
Persil detergent. However, one thing you may be susceptible to is a (very) dirty wash tub itself, especially if you clean oily or tarry clothes. A good detergent MAY release built-up gunk on the OUTSIDE of the tub that has accumulated if the washer has been used repeatedly for some time. When you wash with a superior-cleaning detergent, this gunk will get on your microfiber cloths. To prevent this, P&G makes
Tide Washing Machine Cleaner that you can use with old towels and throw-away rags/old clothes to "collect" this released gunky residue BEFORE you wash your expensive detailing microfiber cloths/towels.
I know
Charlie`s Soaps (another superior-cleaning detergent) ALWAYS recommends doing this with their soap (IE, use THEIR soap with throw-away cloth towels or rags, not Tide`s product), BEFORE washing ANY clothes for the first time to prevent ruining good clothes from unseen wash tub residue that will be released when washing with their superior-cleaning soap.
As a side note; if you need suggestions for microfiber towels/clothes that fellow Autopians use for various vehicle detailing tasks, see:
https://www.autopia.org/forums/car-...ask-list-autopian-suggestions.html?highlight=