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Posted: Fri Jul 22, 2016 11:24 pm
by Forestboy1978
Jet washing patio covered in black spot on Tuesday. Want to apply solution over the weekend and again on the day but I'm out.
Does anyone know of a shop where I'd find 15% hypochlorite over the weekend?
Ta
Posted: Sat Jul 23, 2016 8:07 am
by seanandruby
I would of thought an agriculture supplier, or awimming pool suppliers.
Posted: Sat Jul 23, 2016 8:43 am
by Forestboy1978
seanandruby wrote:I would of thought an agriculture supplier, or awimming pool suppliers.
Cheers Sean 
Posted: Sat Jul 23, 2016 12:43 pm
by Tom - Westminster Stone
Hi Forestboy, i'm sure you've done your research but this is well worth a read before you go ahead http://www.pavingexpert.com/maintain_03.htm
Posted: Sat Jul 23, 2016 5:48 pm
by RAPressureWashing
Tom
Using Sodium Hypochlorite (alkaline) will not damage paving, IE Indian, York, Limestone, Granite, Concrete etc,even on the real tough stuff when the paving has done totally black and had to use it almost neat. Not always nice to use, (use this stuff day in day out) but it gets the job done, there are enough people on here that I have advised and cleaned for.
It's when you buy the off-the-shelf patio cleaners that people get the problems, as most have hydrochloric acid AKA brick acid in them and get used on natural stone that the problems start. There is a mix on the stain removals page for fruit & berries, that mix (you may have to go up to 2:1 ratio) will also remove Lichen.