rob writes:

Looks like most of my interior plumbing is pvc piping and wonder if
its safe to use a little bleach for a bathroom sink to loosen a clog?
It drains but slowly. I'll probably try a plunger first regardless
but I've been meaning to ask if the bleach is safe for interior
plumbing? My house was built in the late 90's if that matters.
thanks.

99% of the time, you can clear up a clogged bathroom sink by making
yourself some sort of hook gizmo with a long handle, and using it to
pull out a big tangle of hair. No chemicals necessary.

-Sandra