A rubber tiler's sponge for grouting. This is _so_ much better to use
than an open-cell foam sponge.

Where do you get these, I had one that was given to me by somebody but it is
now 'cattled' and I cannot seem to find a good one anywhere. My tile
shop(s) keep recommending "Hydro sponges", but they don't look the same.
Cheers

John

P.S. you forgot to mention a box of plasters for the dreaded 'Grout Finger'
from getting the grout right into the wall/ceiling intersection!