DECK WASHING - AN OVERVIEW

I have a comparatively new deck 4yrs aged; that was stained 3mos soon after becoming crafted and over again 2 yrs in the past. not bad on Filth and algae (south going through deck).. really should I use a std restore a deck clearer and power wash for very best success. When you've got some definitely dirty spots, you may have to give them a second