[steve smith]

Can any one recommend a good patio cleaner?

Was cleaning a house today when the lady came and asked if I could clean the patio, I did 1 slab with pressure washer and it cleaned ok but left a few black dots, what will get these off

Thanks

Steve

[david washbrook]

what pressure was you using cause any good pressure about 3000psi + should remove most things

[boldy1304]

i have pressure washed patios for years its not all about the pressure but also the flow rate per min eg 3000 psi 15 ltr min is good i have used 3000psi 33ltr min and on some real bad patios will still leave black spots best useing a little acid gets the lot off quick contact local cleaning chem supplier see if they do commercial acid hope this helps

[steve smith]

Thanks

I'm not sure what psi I'm using, Just wondered if there was a detergent that was good at removing these tougher spots with a pressure washer

Steve