if it isn't used very often.

Actually, the REAL story is . . .I don't use it all that much but what I do is

put my dishes in there to drain after hand washing so the majority of the water comes from the dishes dripping. However, I do run it through a rinse cycle every once in a while otherwise the standing water gets really icky (kind of "stagnant" like) but I still think way too much water is left in the bottom. I piggybacked this to Michelle's question and I KNOW I should have posted as a separate question.

I appreciate your input but I sort of suspect there may be something keeping it fromj draining as well as it should.

http://chemistry.about.com/od/toxicchemicals/a/Mixing-Bleach-And-Ammonia.htm

letting them dry between use is better but should still be avoided. only with thorough rinsing can the risk be reduced.