Microfiber cloth seems to be the choice for me...you can buy them at Wally World for next to nothing. Keep them in a zip lock bag to keep grit out of the cloth and they work wonders. I get them about 16x16" and cut them in quarters. Toss them or wash them they are cheap.
Just to clarify, I'm not looking for something to clean my lens. I'm looking for something for a quick wipe to get the rain off the lens between stations, preferably without removing my glasses from my face.
Why bother? Before you've finished the next station they'll be wet again. My biggest payday shooting came with wind, rain and an error of getting silicone on the bbl. lug so the gun was coming open on every shot. I just ignored it all. Like stupid, brain-dead overcomes all. LOL!