In article ,
Christian McArdle wrote:
They always seem to show them literally cutting through a swathe of
dirt and grime and it seems hard to believe that water alone would do
this with muck that may have been in place for years (i.e. patio).

They are fantastic for cleaning patios. It is probably their greatest
use.

My patio is made from reclaimed Yorkstone, and I couldn't wait for the
moss etc to grow a bit and make it look old. ;-)

--
*(over a sketch of the titanic) "The boat sank - get over it

Dave Plowman London SW
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