Don't Wait

Being a closet environmentalist, I like to flush the toilet only if I have to, i.e. if there's something in the bowl that could be eaten rather than drunk.  Such is not the way, however, in Thailand because even urine supports microscopic metropolises after just a few hours in the tropical heat.  And it smells kind of like steamed brown rice.  Once you do flush it, there's a brown film left on the inside of the bowl, a perfect shadow of your mistake.