Any Suggestions for mold algae preventitive treatment

[Yorkie]

Hi I`ve a customer who requires something putting on his driveway & roof after pressure cleaning to slowdown the re-growth of mold & algae.
any suggestions please?

 

[Guy Blackmon]

Bleach.

 

[Kory]

I suggest you quit pressure cleaning roofs and us the search button and do a lot of reading prior to doing any more cleanings.