As mentioned in a previous post, my wife bought some enzyme drain cleaner (BioSmart). It says on the label to mix one ladel full of the stuff with a pint of water and then pour it down the drain before bed with the idea being sinks don't get much use at night. But it seems to me that the one pint would coat the P trap nicely but the stuff would not reach the more distant plumbing unless follow-up water is run. What do you guys think? Thanks!