Liquid soap on a nylon-net scrubby which makes it lather more and a little bit goes a longer way.
NOT bar soap unless YOU are the one that cleans up the scum that glues the dirt and
curly dark hairs onto the tub and tile.
Leaving soap scum in the tub and shower walls, and a groaty-looking hairy bar of leftover soap for your wife or guest-stay host is rude!
And the antibacterial/deodorant soaps usually have Triclosan as a main germ killer:
FDA: "A large number of liquid soaps labeled "antibacterial" contain triclosan, an ingredient of concern to many environmental and industry groups. Animal studies have shown that triclosan may alter the way hormones work in the body. While data showing effects in animals don't always predict effects in humans, these studies are of concern to FDA as well, and warrant further investigation to better understand how they might affect humans.
In addition, laboratory studies have raised the possibility that triclosan contributes to making bacteria resistant to antibiotics. Such resistance can have a significant impact on the effectiveness of medical treatments.
Moreover, recent data suggest that exposure to these active ingredients is higher than previously thought, raising concerns about the potential risks associated with their use regularly and over time."
FDA Taking Closer Look at 'Antibacterial' Soap