[nathankaye]

Any one recommend a soap and sent to add to bleach .

Used cheap Tesco bleach on some paving slabs that were covered in black spots after trying pressure washing , caustic soda which did nothing . Bleach gave best result not 100% but customer was happy but cannot stand the smell .

You need to buy a batch of hypo and dilute to a suitable application.  My recommendation is to use the search feature on here or look into further threads for more information.
Im not trying to be funny, but my pressure washing results and knowledge has grown immensely due to this site and added research etc, that i trully appreciated. But i appreciate it more due to time i put into finding out.

[paulben]

Not being funny but thought this forum was to help each other out sorry I must be wrong

[nathankaye]

Not being funny but thought this forum was to help each other out sorry I must be wrong

My comment was helpful and only last week this was discussed in full. You can scroll down the feeds or use the search feature on here and it explains it all, esp a post by smurf.
(This question is raised often, very often. So to safe repeating the secrets given many times over, ive suggested how beneficial it is to search for the answer and  unless im wrong, youve taken it the wrong way.

[craigR]

Thanks for that paul I'll probably invest in those after todays test run.
Results  were pretty good and to my expectations except for a few very dark brown / reddish areas on render which certainly faded and I am hoping they'll break down and fade off further over the next couple of days as has been suggested.