How to clean grey paving stones ?

Question

Pressure hose? Cleaning agent?

Suggestions please.

Answer 1

I cleaned my patio yesterday with a Karcher - it really surprised me how well it worked. It removed all moss, grime, 20-year old dirt. Definitely buy/hire/borrow one of those :-)

Good luck!

Answer 2

i cleaned mine a couple of weeks ago.  a jet wash seems to be the way forward

Answer 3

tsp or tsp substitute..mix it with wtaer and take a stiff bristled broom and scrub..let it set then a good common high pressure water hose nozzle will blast it right off..no need for a pressure washer...

http://www.dtep.com/kk-tsp.htm

http://www.dap.com/product_details.aspx?...

http://en.wikipedia.org/wiki/Trisodium_p...

Answer 4

Karcher with "t-racer" patio/decking brush attachment. Comes up like new and so easy to do !

Answer 5

Pressure hose should do the trick.Careful around the joints as you can blast them out , which means re pointing.

Answer 6

Another method is to cover the stones under a tarp for a month (not so practical in summer). The bio-film which covers the stones creates an adhesive for the dirt. Without light this will die - then just blast off the residue. it'll stay clean for a long time afterwards.

Answer 7

Elbow grease! good for you and the environment, use a weak bleach solution and scrub with a stiff yard broom. Rinse off with clean water. Removes grime and algae, simple.