Dirty green slabs

[Purist]

Are there any cleaners that will remove this horrible green grime from my slabs or is a brush and soapy water best?
Thanks

[lutonlagerlout]

brush and bleach/water mix
cheers LLL

[eazybarra man]

A rotary cleaner (pressure washer) makes a great job of slabs, brings them up like new.
I think you can hire the kit from hire shops.
There is good money to be made cleaning slabs and monoblock with this kind of kit too

[RAPressureWashing]

Sodium Hypochlorite @ 13-15% aka chlorine bleach (swimming pool bleach)
Mix it 1:1 with water, dwell time 10 mins then pressure wash off, just watch your run off area as this will kill grass, plants etc.
Wear goggles and nitrile gloves.

[lutonlagerlout]

^^ roger knows cleaning
LLL

[IanMelb]

Roger Oakley BDA(Europe)Member 2006

Just noticed this bit, doesn't it scare anyone that a member of the british Dental Association is giving tips on pressure washing and using chlorine to clean things up? I'd hate be involved in that tooth whitening procedure !

[RAPressureWashing]

LOL very good Ian, but it doesn't mean that. (British Dental Association)

[IanMelb]

I just remember the old Python sketch:

“Flemming, Flemming.�
“Flemming of the B, D.�
“Flemming of the B D, B D, B B B D D D.�
“Flemming of the BDA. A. A.�

“It’s a man’s life in the British Dental Association�

[eazybarra man]

Purist is looking for a cleaner for slabs and now he knows about British Dental association and monty python. Everyday is a school day!!!!

[James.Q]

just had same prob the big boss wife; slimey flags can you sort out; tecnical department of very large paving company advice woz hot soapy water and a yard brush she said then tell them to come around and do it for her i know there rich but the firm woz marshalls. i had to laugh

[seanandruby]

envionmenaly friendly way... wet course grit sand brushed back and forth. :;):

[Purist]

Thanks everyone for your help.

[keyhole]

Hi - as a newbie here, I am a bit late on this thread.....

I've laid a few patios myself over the years, and this surface cleaning problem has troubled me many times before. The 'green' is an algae that multiplies in the winter months, and it is quite hard to shift. I have previously tried power washing and tried several abrasive scouring methods - none of which were 100% satisfactory.

A few years ago I relocated and my new home needed a patio. I am now entitled to a bus pass, so I decided to have it laid by professionals. My choice of stone was called Fossil Mint (a mixture of greys and greens) and it was imported from India. The surface really does reveal fossils of ferns!

Within two years my new patio was badly affected by the green algae problem, and surprisingly the constructors had little advice to offer me.

I achieved complete success last Spring using Jeyes Fluid, and the patio was restored to its original new condition. The chemical is quite corrosive, even when diluted with water as required, so care must be taken not to splash other surfaces.

But the final result is better than any alternative, imho.

David

[lutonlagerlout]

they aint fossils, they are iron deposits keyhole
they sure look pretty though
regards LLL

[keyhole]

LLL

You could be right too..!! I wondered why there were no pre-historic creatures in there as well.