I can't imagine that a dollar bill would not hurt the sound a bunch.
I definitely noticed a little hit on the high end with the washcloth, but it worked on the wind, so I think it was worth it. I had no time to go to a store for teddy bears, headphones, etc. I might have been able to find a tampon, but I was trying to McGuyver it with what I had in front of me.
Now that I'm back from the show, I need to find some good screens for these, as well as for my at4051's. Windtech?