Soft Washing in Harrison Township

Algae, mildew and mold grow only during the hours a surface stays wet, and Harrison Township walls stay wet longer than most in the county. The canal plats sit over still water that holds humidity between close-set houses and pools fog through the morning. The river streets near the mouth of the Clinton River are shaded by the Lake St. Clair Metropark nature area and the river bottomlands, so they add shade to the damp. Even the open lake lots, which get the wind, take spray on east days. A north wall inland might log two damp hours a day; the canal side of the same house can log six.

Soft washing answers that clock with chemistry instead of force. The solution goes on at low pressure, dwells while it kills the growth down to the root, and rinses off at garden-hose pressure. Pressure washing does the opposite: it shears the visible layer off the top and leaves the root alive in the siding texture, which is why a canal wall that was blasted clean in May is green again by August. The difference shows most on the vinyl and aluminum-sided canal homes, where the water-facing wall runs about a year ahead of the street side. Our comparison of the two methods goes deeper.

Killed growth takes time to return. On the canal side and the shaded river streets, a soft-washed wall stays clean for two to three years; on a lake lot that gets sun and wind, longer. The same chemistry works on the vinyl and brick-front condominium buildings along Jefferson and the river, on the marine buildings along S River Rd, and on the wood and composite around a boat well. Soft washing a house starts at $349, and because the crew is about 15 minutes from the Clinton Township shop, a canal-side refresh between full washes is easy to slot. Our post on why lake homes grow mildew faster explains the drying-hours math.

Why the Rinse-Only Wash Fails Here

The common failure on this shoreline is a wash that looks finished and is not. High pressure takes the green off in an afternoon, and the owner is satisfied until the fog season brings it back from the roots that were never touched. The same pressure forces water behind vinyl laps and into the sheathing of a house that already lives in humid air, and on the seawall side it carves mortar out of joints that stand a foot from the water. A second failure is solution too strong for aluminum, which streaks the chalked finish.

Timing It Right

Soft washing works in any frost-free month, because the chemistry does not depend on heat. The canal streets book heaviest in April and May, before launch weekend fills the docks, and again in July once the fish-fly hatch is over. Shaded river streets near the Clinton River bottomlands sometimes need a single-wall refresh in the second year rather than a full wash in the third. Fall works well too, when the water side is easiest to reach with the boats out.