Recently I found an important tip for using a bread machine.  I was researching replacement bread machine pans.   Many people made comments like this:

NEVER put cold water in the bread pan while it is still hot after baking. This will warp the base of the pan and cause the beaters to scrape the non-stick coating off in a circular pattern. ALWAYS let it stand to cool before washing it out.

The instruction manual that comes with my machine does say to let the pan cool completely.  However I didn’t know that the pan could actually be damaged by putting cold water into it before its temperature dropped.  Yikes!