All of the towels I use are the culmination of many years of trial and error. As I'm sure you know, microfiber towels aren't cheap. I'd be ashamed if I actually added up how much I spent to get to this point. I know I can save you a lot of time, energy, and money by giving you access to buy exactly what I'm using on my cars.
This is the towel I use to clean my countertops, wipe dirt off my hands, or remove some adhesive with something like CarPro TarX. These are good enough, but cheap enough to replace when needed.
Number I have in my cabinet: 20.
Note: Since I buy in such volume, I'm able to get all of us better pricing than you'd get on your own. I sell these towels at the same price that you would pay if you bought them in bulk 25+.
320 GSM: This is the weight per square meter of material. The weight does not necessarily mean the thickness.