zimmerDN, I bought a similar product, Micro-Restore from Ian over a Autofiber.com. It works quite well. Since that purchase I was also guided to Charlie's Soap by Bretfraz, using it for my normal laundry as well as MF towels. It also works very well. Before either of those, I used liquid Purex.
I agree with the vinegar in the rinse water. I use that on the majority of my laundry, MF or not. Sometimes a second rinse for your MF products is worthwhile. You can always check your final rinse water to tell if the second rinse is necessary.