I have a large patio at the rear of my house, which is in the shade and out
of the weather most of the year, and therefore gets green with algae and
also dirty.

I've tried a couple of cleaners, like Jeyes etc., and nothing seems to
*really* work - it still looks a bit dingy even after a good soak and scrub
with a brush. It's spring again, I've just had a good go at it this morning
and it doesn't look that good ...

Any suggestions for a really good, effective cleaner anyone ?

Thanks.

Barbara