indeed, a la sandblasting off decades of "grim" soot based northern-
ness from countless town halls, church steeples etc - AIUI often
leaves a surface that deteriorates *more* quickly than if it was left
alone. Something to do with the soot creating "harder" compunds with
the top few thou of the stone....
cynically one could also observe that the same firms that recommend
and then do the sandblasting are also the "specialist stone masons"
that then magically appear at vast expense to repair the damage that
their "cleaning" initiated/caused....mmmmm....
hmm, last year's favourite tool, the angle grinder? :-)
I sympathise - doing the patio with a pressure washer was always a right
pain in the bum. Thankfully we just don't seem to get algae here - maybe
it's a humidity thing.
I wonder if I cover the area with coal ash or wood ash it wood help prevent
this happening so often. I read gardeners use this for getting rid of moss
so I wondered if a covering of the former would do the job.
"Owain" < firstname.lastname@example.org> wrote in message
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