Black lichen spots won’t shift

[scottish cleaning service]

My young brother pressure washed his driveway with his karacher and thought he had done a good job. Days later the weeds begun sprouting from it. Lichen was still there and he hadn't  removed any. I spent 3hrs today going over the whole driveway with my fsc, turbo and then my vario nozzle. His driveway now looks brand new and he couldn't believe the difference. I'm hoping to get some jobs out of it as his estate is full of monoblock driveways. :1f609:

 

[Charlie@AquaClear]

Hello all, some advice please. I’m a beginner with pressure washing. I have invested in a 24” surface cleaner and Honda pump giving 21lpm. Can you please run through the steps of application of chemical, time to leave on and pressure. Also best chemical to use and where to buy. Thanks in advance [emoji106]


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