Deck Washing FAQ – Bateman Power Wash, Terrebonne & Greater Montreal Table of Contents Question & Answer Q: How often should a deck be washed in Quebec? In Terrebonne and the Greater Montreal area, most decks should be washed once a year to prevent mold, algae, and dirt buildup. Shaded or high-traffic decks may need cleaning every 6–8 months. … Continue reading Deck Washing FAQ –