More a general problem than a growing one

Can't identify that mould? Got a great tip for keeping slugs at bay? Suggestions for organic weed control? Post them here...

Moderators: KG Steve, Chantal, Tigger, peter

User avatar
Primrose
KG Regular
Posts: 8053
Joined: Tue Aug 29, 2006 8:50 pm
Location: Bucks.
Has thanked: 37 times
Been thanked: 281 times

Any advice on how/what I can use to get rid of these unsightly black mould patches on our yellow coloured paving slabs?

And is now a goos time to try and do it with winter ahead or should I wait until spring when the worst of the bad weather is behind us? The recent rains seems to have made them worse.

Jet washing removed all the cement in the cracks on a previous occasion so don't want to go this route again.
Attachments
45D1F383-FFF5-4CEC-9F69-B63ADDB70C09.jpeg
45D1F383-FFF5-4CEC-9F69-B63ADDB70C09.jpeg (3.51 MiB) Viewed 2336 times
User avatar
oldherbaceous
KG Regular
Posts: 13822
Joined: Tue Jan 24, 2006 1:52 pm
Location: Beautiful Bedfordshire
Has thanked: 254 times
Been thanked: 295 times

Dear Primrose, i'm surprised the mould just doesn't fall downwards... :)

All joking apart, Wet&forget is the stuff to get...dilute it down, apply with a watering can with a rose on, then I use a soft broom to brush it about, just to make sure it gets into everything. Might be a little late in the year, as the surface should be dry when applied and stay dry for a good while after it has been applied... but I would still be tempted to try it, as long as rain isn't forecast.
Kind Regards, Old Herbaceous.

There's no fool like an old fool.
User avatar
Geoff
KG Regular
Posts: 5574
Joined: Thu Nov 24, 2005 5:33 pm
Location: Forest of Bowland
Been thanked: 129 times

There are a few similar things about, I use one of almost the same name on cobbles, Simply Spray and Walk Away. Don't know if the Black Spot Remover is any more effective for the specific problem. Got a 5% off popup today by the way.

https://www.hygienesuppliesdirect.com/c ... o-cleaners
robo
KG Regular
Posts: 2808
Joined: Wed Oct 24, 2012 10:22 pm
Location: st.helens
Has thanked: 9 times
Been thanked: 56 times

You could use brick acid it’s meant for cleaning cement off brickwork so should work
sally wright
KG Regular
Posts: 722
Joined: Tue Nov 29, 2005 7:32 pm
Location: Cambridge

Do not use Brick Acid on concrete paving slabs, the surface will be ruined and if they are surface coloured then this will come off as well.
Regards Sally Wright..
Post Reply Previous topicNext topic