I use hypochlorite obtainable from agricultural suppliers. I make a 30%
solution and apply with a watering can. Whether it is safe? wear goggles,
gloves and wellingtons. Keep children and animals indoors.
"alan kearn" wrote in message
oups.com...
Does anyone know of a cheap safe and effective stone cleaning liquid
to help in cleaning the rough stone surface of my patio. Yes I also use
a Pressure Washer.

Thanks

Alan