Unfortunately,
ceramics also have the weakness of being
porous. This means that the tiles have
small (perhaps microscopically small)
holes in them. Various tiles have different
degrees of porousness, but all of them
have it to some degree or the other.
Why is this a disadvantage? Among other
reasons, the pores allow dirt, and fungus
into them. Since we're not using the tiles
for structural reasons, this is not a
worry. However, aesthetically (and possibly
from a health angle), it does matter.
Most bathroom tiles are 'glazed' tiles.
Glazing is a process that provides a glossy
finish to the tiles, and forms a protective
layer over it. This means that the pores
are pretty much sealed up, and the tiles
are therefore easy to clean.
However, the real difficulty is cleaning
between the tiles. This is called 'grout'.
It is made up of a mixture of cement,
sand and water. It gets dirty very easily,
and can present a real challenge to clean.
It is impossible to use harsh chemicals,
as these can discolor the tiles themselves.
The idea while cleaning therefore, is
to clean effectively between the tiles
without ruining them.
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