"Saxman" wrote in message
.. .
Has anybody got any effective ideas as to how one can get rid of green
mould on greenhouses/conservatories and to help prevent its re-occurence?

I do use a pressure washer, but still have to use it about a couple of
times a year.

You don't say whether the material is glass or plastic?

Having cleaned the surface give it a rinse with household bleach (aim at
approx 2.5%sodium hypochlorite). Rinse off and apply a silicone treatment
such as the ones sold for car windscreens.
The glass should stay clean as the algae gets washed away by rain . When and
if the algae reappears it can be easily removed with a quick wash