I'll chime in on this thread (MF TOWELS only) since so many opinions.
Have an HE washer, use 1-2 oz of Chemical Guys MF wash (bought 1 of those 32 oz measuring bottles - COOL!) I sort (after use) the towels into Light, Med or Heavy "dirt." I run the "light dirt" towels on Hot - Regular, Stain Removal & Allergy Rinse. The other towels are presoaked in separate 5 gal pails with MF wash in them (I'm not in a rush so it's a day or 2 before I get the them. LOL). I use HOT WATER - because I have trimmed water heater to 120 (or so) degrees. As stated earlier in this thread, no one needs 140-160. Wasteful & dangerous. Plus, specs on our washer shows the temp it heats wash water to. (IIRC, it's 120 as well.)
I do 3 diff loads. I usually stop the washer in mid-cycle to allow for addt'l 30 min or so of soaking of the dirtier loads.
Dry - LOWEST heat setting (older dryer, not steam, etc.) to almost dry. I'll run "Fluff" setting sometimes, which tumbles w/o heat.
Yes, I know, I should segregate the glass towels, etc. I don't have a car biz, so I have a large, but not huge MF towel collection. (I have a MF ranging from "ok" towels to Gold Plush & Eagle Edgeless. Mainly the better quality.)
HTH,
Allan
PS - Just to see how many OTHERS have interest in this topic, look at the suggested or similar topics below this thread - all have almost SAME thread title too! Maybe there ought to be an official thread or "Sticky" for this!