Cleaning 'stone' and grouting on garden wall

twopenny

Hoping someone has experience here and can help but I posted on the DIY forum and it's received spectacular lack of interest compared to more interesting things.

I'll just post the link because it has the explanation and photos. Any thoughts are welcome.

https://forums.moneysavingexpert.com/discussion/6254148/cleaning-stone-and-brick-mortar-in-garden#latest

I don't know how to get a thread moved.

Flugelhorn

I had some similar and they came up well after jet blasting - I know you aren't supposed to do it very often as can damaged stone but was very effective. I did huge amounts of it in the sunny weeks we had when lockdown started last year, all sorts of leftover jobs were done!

twopenny

Thanks, don't have the equipment. My nieghbour does but while boasting about it I though he might offer to lend. That didn't happen

I tried spraying bleach. Had to be careful because of new plants and it was medium effective, in some parts more than others. Then used the wire brush carefully and they are looking better. A bit of patina, brighter but less just neglected.

While I'm doing the slabs I'll drop hints around about a jet blaster.

greyteam1959

Well I think they look great & I certainly would not worry about cleaning them at all.
If you really really hate the look then it would probably be cheaper to replace the copings rather than spend lot of money on chemicals that probably don't work.

Scot22

I am thinking of buying power washer for this and general use.  Must be cordless and easy to use.  Favourite is Worx hydrology at £120, top of my budget.  Any comments or other suggestions ?