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  James Brett June 9, 2015 at 9:23pm

  The karcher stuff is alright. But I haven't used it commercially! Only around the house. Not sure how much better it was using it though :/
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  Stephen Hargreaves June 9, 2015 at 9:51pm

  I used Sodium Chloride on my own paving before using the pressure washer and it worked well breaking up the ingrained dirt. Its also quite cheap on Amazon and covers a large area per litre (Let down) I have used various other chemicals on paid jobs but non work better
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    Phil Voice > Stephen Hargreaves June 10, 2015 at 7:42am

    Stephen

    Do you mean sodium chlorate? Sodium chloride is salt.

    I'd be a bit careful when using sodium chlorate, especially if there is a likelihood of run-off onto lawns and/or planted areas.

    Although it's now banned, sodium chlorate can be used as a total weedkiller.
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      Geoff Norfolk > Phil Voice June 10, 2015 at 8:14am

      I think Stephen might mean sodium hypochlorite which is used in swimming pools........  When I was searching for a solution to getting rid of the black spots on paving that pressure washers find difficult to remove, it was recommended to try this.
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      Stephen Hargreaves > Phil Voice June 10, 2015 at 8:54am

      Yes, I was thinking of the product name written on the drum I think. Its a burning chemical in strong concentrations so you have to be careful handling
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  Robbie June 10, 2015 at 8:21am

  I use watered down hypochlorite before I power wash, although I have clients who use it and don't power wash at stronger doses...

  It's nasty stuff and you do need to be carefully, however it does an excellent job.
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    Stephen Hargreaves > Robbie June 11, 2015 at 2:00pm

    Hi Robbie. What dosage rate do you usually use with this? I use 150ml to 5 litres water
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  Stephen Hargreaves June 10, 2015 at 8:52am

  Yes it is hyperchlorite. I've not known it to damage plants and lawn if washed off which lessens concentration. Its used for all sorts of things comercially. I normally water it on the surface and brush it across area. I've been using it on York stone. Then it can be washed off or pressure washed which I do when it has dried. Its great at getting rid of marks and the smells of a dog area!
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  Stephen Hargreaves June 11, 2015 at 1:58pm

  This might help?
  Sodium Hypochlorite 12-14% Active Chlorine 25L inc Hazardous Courier Delivery https://www.amazon.co.uk/dp/B00E0I4JR8/ref=cm_sw_r_awd_qhyEvbMXSC5FH