Most bath tub is clogged by hair. A plumber’s snake is a great tool to remove hair in the drain. However, some tub constructions do not allow the snake to get inside the drain hole. In situation like this, if there is a tub access cover, you can put the snake through the access cover to remove the clog as shown below.

Unclog Drain from access hole
Unclog Drain from Access Hole
Hair from Sink Clog
Hair from Sink Clog

By homer