Aren't most of the MF specific detergents just APCs? Anything without dyes, bleach or fabric softener can be used to clean MF towels. Warm or cold.... if you have clogged MF towels it is perfectly safe to let it soak in boiling water to release the product that was clogging the towel. MFs really aren't that delicate.
Bags- I use a scoop or two of Oxy Clean to clean my MF towels along with Tide detergent in the washing machine... works fine. I also fill up the sink with dawn and a scoop of Oxy Clean to clean my pads by hand.. absolutely no issues with the Oxy Clean... great stuff, IMO.