[Ben wood]

I have been asked to clean the algae of some ouside plastered walls. he wont have it jetwashed and wants me to use wfp and a chemical. any ideas what would do the job as put virosol on it, it took some away but still left some bad marks on the walls. Any ideas what i can do

[Small but perfectley formed]

I think hypochlorite solution will clean this but you will need gogles etc and a safe area to apply in case in gets on other property and people

[Matt - aquatec]

Wet and go....  It's a spray on and leave product available from Costco ....  Google it and it does work.... Takes a couple of weeks...

Cheers

Matt

[Nathanael Jones]

Sodium Hypochlorite (Bleach) works brilliant for this.

[prestigeclean]

i assume you water the bleach down , what ratio do you use please , i have a big clean down to do next month regards alan

[Elfyn]

You could go for the safer option - Armillatox
It can be bought from Amazon