Cooler Weather Offers a Chance to Clean Up Summer's Grime

There is a noticeable change in the air this time of year. After months of sticky summer humidity, we're finally enjoying cooler mornings, crisp afternoons and the kind of weather that makes working outside a pleasure rather than a chore.

While the humidity may have moved on, it often leaves a few reminders of what moisture can do to a home. Take a walk around your house and look closely at your siding, porch railings, steps, and shaded areas. You might notice green patches, dark streaks, or a dingy film that wasn't there in the spring. Months of warm, damp weather create ideal conditions for algae, mildew and other organic growth to take hold, particularly on the north side of a house or anywhere that doesn't get much direct sunlight.

Since we aren't quite into the thick of leaf cleanup season yet, and it's not cold enough to put away the outdoor tools, mid-October is a good time to tackle some of the grime that's been building up around your home's exterior.

Start with the siding.

Green algae and other discoloration can develop in areas that stay damp, particularly behind shrubs, beneath overhangs and along shaded walls.

Fortunately, you don't necessarily need to drag out the pressure washer to address it. Products like Wet & Forget and other exterior cleaning solutions are designed to treat organic growth on siding, decks, and other outdoor surfaces. Some are sprayed on and left to work gradually with the help of rain and weather. They generally won’t damage your landscaping or plants, although I would take care around vegetable gardens. 

Just remember that these aren't instant fixes. Depending on the product and the amount of buildup, it can take weeks or even months to see the full results. Always follow the manufacturer's instructions, including temperature requirements and precautions for pets and vegetation.

Don't overlook porches and railings.

Porches are another place where summer moisture tends to linger. White railings, columns and trim can develop dark spots or green discoloration, especially where there's limited airflow.

A gentle cleaning can make a noticeable difference. Before reaching for a strong chemical or pressure washer, check what cleaning methods are recommended for your particular surface. Painted wood, composite materials, and vinyl don't all respond the same way.

Be careful with pressure washing too. A lot of pressure can damage paint, force water behind siding, or splinter wood. More pressure isn't necessarily better.

Pay attention to what's underfoot.

Algae and other organic growth aren't just unsightly. They can make steps, walkways, and decks surprisingly slippery, particularly after rain.

Check shaded entryways, concrete steps and areas around downspouts where water tends to collect. These are worth cleaning before fallen leaves and colder temperatures make footing even more unpredictable.

If you're using a cleaning solution, make sure it's approved for the surface and follow any instructions about rinsing or keeping people and pets off the treated area.

Look for the reason it's growing.

Here's something I always tell homeowners: Cleaning is one thing, but understanding why a problem keeps coming back is just as important.

If the same section of siding turns green every year, take a closer look. Are shrubs growing too close to the house? Is a gutter overflowing? Does a downspout empty right next to the foundation? Is there an area that never gets enough sunlight or airflow to dry out?

Sometimes a little pruning, improved drainage, or a simple gutter repair can make a bigger difference than another round of cleaning.

And remember, not every dark stain is mold. Algae, mildew, dirt, and other buildup can look similar. If you suspect significant mold growth or moisture damage inside the home, that's a different issue that deserves professional attention.

Take advantage of the weather while you can.

One of the nice things about October in Connecticut is that we often get a stretch of beautiful, comfortable days before winter settles in. They're perfect for smaller outdoor projects that are easy to put off during the heat of summer.

Choose a day that meets your cleaning product's temperature and weather requirements, and pay attention to the forecast. Some treatments need several hours without rain, while others shouldn't be applied when freezing temperatures are expected.

A little attention to what summer left behind can help keep your home looking its best and give you one less thing to worry about when spring rolls around.

Bob O’Donnell is the owner of O’Donnell Bros. Inc., a Bristol-based home improvement company established in 1975. Email your questions for Bob to info@odonnellbros.com with the subject line “Ask the Pro.” All questions may be considered for publication. To contact Bob for your remodeling needs, call O’Donnell Bros. Inc. at (860) 589-5155 or visit odonnellbros.com. Advice is for guidance only.