How often do you guys and girls take out your water dishes and clean them out? Does "old water" cause a problem? I fill up the dishes every other day but should I be cleaning them bi-weekly or something???
never had one long enough to worry...i just use plastic milk jug caps and other assorted bottle/plastic container caps (peanut butter jar lids, lids from Minute Maid juice cartons, etc) depending on the size of the T. Use em for a week or two and then throw it away and replace with a new one.
It wouldn't hurt to at least wash it every couple of weeks if you have a permanent one though. As long as the T isn't pooping in it and there are no dead food items in it you shouldn't need to worry very much though.