Wet Pacific Northwest winters are notorious for creating moss, algae and mildew on walkways and public thoroughfares like sidewalks. To keep your family, friends and guests (any maybe even your insurance agent) safe, it’s important to clean or pressure-wash your exterior surfaces. Regular maintenance cleaning will help control and mitigate the annual growth cycle of moss, mildew and algae – all of which lead to early deterioration of your exterior surfaces like sidewalks, driveways, patios, decorative concrete, fences, decks, siding, and more.