In the words of the good man Mike Phillips....."Keep it super simple."
You basically need 5 towels categories to serve these functions:
- Drying - Waffle weaves, keep 3 to 4
- Paint only towels - 350GSM dual pile is a great towel honestly and can do anything. Don't complicate it. The gold plush as shown above or my fave...CarPro Boas are excellent towels. These would be for: Quick Detail spray, wax/sealant removal or application and removal for spray types, compound/polish removal, waterless wash, etc.
- Crap towels in 2 colors - One color (i do black) for wheels, tires, wells, jambs. Another color (I like bright color to see dirt transfer) for interior detailing
- Glass towels
- And lastly - Cotton terry towels for scrubbing carpet and drying tires
I literally follow this exact practice, except for coating specific towels as well and life is simple man.
CarolinasFinestDetailing nailed it. Really good advice!
If you know that professional detailing is in your 5 years plan, I have simplified my microfiber towel arsenal down to 3 separate classes and because I buy them wholesale, my cost per towel ranges from .50-$1.50 for towels that can be washed over and over without degrading unlike the kirkland microfiber towels, while costing only pennies more.
All of the microfiber towels I own and use are chinese made edgeless towels. I know that some korean made towels are able to last 100's of washes without degrading, but as a business owner, quality chinese microfiber is the best option for me because it doesn't scratch, it's cheap, and once it's been used and washed 30-40 times and starts to look stained and dirty (even if the performance is unaffected) I will replace it and use the old one for dirty jobs like wheels/tires/engine bays.
The 3 towels are:
245gsm edgeless: glass, all interior cleaning, door jambs, trim cleaning, compound removal
365gsm edgeless: compound, polish, and wax removal
420gsm edgeless: waterless, rinseless, drying, spray wax, wax removal, LCD screens, gauge clusters and instrument panels
While there is some overlap I have found these 3 towels to be the perfect combination for someone who's trying to run a profitable detailing business.
I also have some kirklands left that I only use for tires, wheels, metal polishing, sticky nasty interior cleaning. Basically anything that is gross enough that I'd rather use a disposable towel. Although because I'm cheap even if it's gross I'll typically soak the towels in degreaser for a few hours to get most of the crap out and go ahead and wash them.