I buy the blue shop paper towels from WM or wherever for oil changes and save one that didn't get too loaded up in the change process for wiping the dipstick off during level checks.
I'd assume those paper towels are lower in lint than kitchen towels, but I sure don't have any proof for that.
I don't use anything too filthy on the dipstick as I'd like to avoid adding contaminants to the oil, occasionally I will break out a brand new blue towel for the dipstick when the one I am using looks too grody.
I wonder if there are guys who let their cars drip for a whole day during the change to get every last bit of whatever out and then use a rag loaded with sand, bark mulch, brass shavings, and pieces of egg salad sandwich to wipe their dipstick off?
I actually think about this when I use my extractor, too...I always wipe the tubing off quickly with a reasonably clean paper shop towel before shoving it down the dipstick tube.