On 12/21/2014 10:19 AM, mungedaddress wrote:
To help avoid the latter issue I will once / twice a year fill the
shower / sinks with drain cleaner and let it sit. Some times I will do
it on a three day weekend. Then run hot water when we get back. Helps
reduce hair and gunk build up in the traps.

Mike in Ohio

My AC guy turned me on to using white vinegar. Cheap and safe and was
ultimately what unclogged a bathroom vanity drain after religiously
using, the safe for the environment, drain cleaners that seemed to make
the problem worse. Need a little more umph? Add baking soda.