If I'm cleaning/polishing the bike and/or windshield, I always grab some new micofiber. Don't have any used specifically with Rain-X, can't use that on most plastic windshields anyway so don't use Rain-X. I have a box I keep used rags in, plus a couple boxes of paper towels. For general use, I'll buy a plastic bag of plain old "rags" that have been commercially washed then cut up into smaller pieces. They're usually quite soft but I don't use them on the bikes and since they're real cheap per bag, I often toss them after a few uses.
I'm not that organized and my workbench shows it.
