AZ in Colorado Springs
I have eight Irwin squeeze clamps, 6" and 12". They're very handy.

I have a couple of Bora squeeze clamps; they leave some sort of residue and you can see the pattern of the clamp pad on the stock after removing the clamp. They aren't greasy or dirty and I've cleaned them with water and with mineral spirits but they still leave an image. So I don't use them on finish-sanded parts.