How do you remove hard water marks from a coffee pot?

If they are not too bad here's what you do:

Mix about 1:6 white vinegar and water (one part white vinegar to 6 parts water) in a spray bottle. Add a small amount of joy or dish washing liquid to the mix. Spray the class, let sit for a few minutes. It should come clean.

If it needs more work, you may use a 000 steel wool. It will not scratch the glass and aid in the removal process.