In one of the recent live detailing videos Mike mentioned washing with Microfiber towels and using one per panel and then throwing them all in the wash after. This was very intriguing to me. I've been using the Koala Wash Mitt, wool wash mitt, best car wash mitt or Merino Wool MonsterMini Wash Mitt for about 10 years now and they work great but over time they do induce minimal marring to the paint. I use the two bucket method and a foam cannon. My question about the Microfiber method is how long do the cloths last before they need to be replaced? Is this method viable on a car that is "very" dirty? I usually wash my vehicles regularly enough that to normal people they aren't dirty but sometimes if it's going to rain all week or after a trip or something they can be what I could consider "very" dirty. Would dirt get caught in the Microfiber which would also cause marring to the paint?