Tub drain clogs are often hair and grease. To clear that
chemically, you need dry crystals of hydroxide.

Drano crystals come to mind.

http://home.howstuffworks.com/how-to...in-repairs.htm

Let us know what works.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
..

"JH" wrote in message
...
: Today the tub refuses to drain, even a little
: bit. I tried the following and none worked;
:
: 1) plunger (while trying to block the overflow
: hole)
: 2) taking the thingy out the switches from shower
: to tub mode
: 3) snaking the drain by hand, both from the drain
: and the overflow hole
: 4) vinegar and baking powder
: 5) boiling water
:
:
: None are working! Any other ideas?
:
:
: Thanks in advance!