[Grovenet] Cleaning a tub

[Chris Genly]

Hi, All.

We have a white bathroom tub which we are finding difficult to get 
clean.  It's the old porcelain kind (maybe with cast iron frame 
internally).  Not so old that it has feet.  The floor of the tub is gray 
and dirty.  We've tried hard scrubbing.  Even tried steel wool (which is 
a bad idea because is discolors the surface).   If you have any ideas 
about how to clean a tub please let me know.

Chris Genly