Wash them for sure, and also what's the weather like where you are? I know when it's colder out my drying towels don't pick up as much water, and streak a bit too
I went through the same process as you a few months ago, ended up with the 21 and the extra 5" backing plate. Loving it so far, good luck picking one out!
At the end of the day, it doesn't matter what any of us say, it's about you and your life and if detailing isn't what you want anymore than best of luck to you in the future! And good luck on the sale as well
My girlfriend and I never spend over $20 for Christmas or birthdays on each other. Being college students with no money, it helps us both out, plus you really dig deeper to get something extra special. It's worked great for us!
I've had a few for a little while now and I really enjoy using them. I mainly use them to dry off cars the way Larry does in his videos. For the price they're a great towel!!