On 28/08/2018 15:57, Malcolm Race wrote:
On 28/08/2018 13:16, Martin Brown wrote:
On 27/08/2018 14:31, Broadback wrote:
On 27/08/2018 13:01, Jeff Layman wrote:
On 27/08/18 12:21, Endulini wrote:
Hi Folks,

I would like to clean a build up of moss off my patio area, I have a
power-washer to do the final clean but it has struggled in the past

I'd be interested in a recommendation, too.

What sort of power-washer head are you talking about? IME, the
rotating heads do not clean anywhere near as well as the standard
lances, but then again they don't make anywhere near the mess that
lances do.

Biological washing powder kills moss very well.

Mainly because it is so caustic.

Very good on lawns as it does not affect the grass. Not tried it on
stone though.

Ferrous ammonium sulphate works even better on lawns. Kills the moss
by making its chlorophyll go black and gives the grass a nitrogen
boost. Don't ever get it on paths though unless you like rusty iron
stains.

Sold as sulphate of iron (chemically I believe is ferrous sulphate)

It works better as iron sulphate cut with ammonium sulphate and sharp
sand so you can see where you have treated (sold as lawn sand).

You can also apply as a liquid dissolving some of each in a watering
can. Iron sulphate on its own will make the moss black but potentially
burn the grass if applied too strongly. The ammonium salt gives the
grass a bit of a boost at the same time. The two together work more
effectively than either one component on its own.

I typically buy spring grass feed about now when the garden centres are
selling it off cheap to make way for Dracula's Cavern/Santa's Grotto.

--
Regards,
Martin Brown