What do you guys use to disinfect your tanks?

I use diluted simple green. I not only cleans and disinfects the tubs but it also doesn't leave any residue on the tubs that needs to be wiped away a simple rinse and let the tubs drip dry and they are good. Plus for the really tough stains a little stronger solution will break down the poop in the tubs without having to do all the scrubbing to the tubs you would have to do with other cleaners saving you lots of time to do other things, like feeding or giving them fresh water :)