No problems at all. I was shooting with my ES-10-22mm lens. I just dried it off.
One thing to mention, the 10-22mm isn't one where the barrel moves up and down, the zoom is handled inside the lens itself. (I know there is a term for this, but I don't know what it is)
I think that helped matters. Plus the 20D is one tough mudda!
I shot around 400 shots after this that day.. no probs. :-)