power steering slips when wet

[RadioFlyer90]

I've noticed when driving my wife's car that the power steering quits when it is wet out. I am assuming that the belt gets wet and slips. The belt is not terribly old (at least in my estimation) and it seems to be at the correct tension. In fact, I feel that it is a little too tight, having tightened it up in an attempt to fix the problem, but without success. The belt appears in good shape- no cracks or obvious wear. Is this just something that comes from the pump being so low to the ground?

[toyomoho]

The belt could be glazed. Check for glazing of the belt and pulleys.

[RadioFlyer90]

The glazed belt would be easy to fix, and cheap enough to try, but what would I do about the pulleys?