04/24/2026
If your siding looks green or dusty right now, you're not imagining it. Winter does a number on your home. Months of rain, snow, and damp air feed mold and mildew, especially in shady spots and on the north side of the house where things stay wet the longest. Once it warms up, that mold doesn't go away. It grows faster.
Now add pollen on top of it. That yellow film all over your siding, trim, and soffits isn't just ugly. Pollen is sticky. It holds moisture against your home and gives mold even more to feed on. The winter buildup and the spring pollen together can cause real problems if you let them sit.
It's not just about looks. Mold and mildew do more than make your house look dirty. When they sit on painted or stained surfaces for months, they break down the finish. That green or black staining you see isn't just sitting on top of the paint. It's eating into it. The longer it stays, the worse it gets, and the more work it takes to prep for repainting. Homes that get washed regularly can get two or three extra years out of a good paint job. That's real money saved.
There's a health side to it too. If you or anyone in your home deals with allergies or asthma, mold on the outside of your house and heavy pollen in the air means every time you open a door or window, both are coming inside. A clean exterior cuts down on what makes it in.
Here's some tips I've learned along the way:
- Not all siding can handle the same amount of pressure. Vinyl holds up fine, but wood, painted surfaces, and fiber cement can get damaged if you use too much pressure or get too close. A wide-angle tip (25 or 40 degree) held about 12 to 18 inches from the surface is a safe place to start. If you see the paint feathering or the surface roughing up, back off.
- Always work from the top down so you're not streaking dirty water over clean areas. Hit the spots under your eaves, around your gutters, and anywhere water tends to sit. That's where mold digs in the deepest.
- While you're at it, rinse out your gutters and downspouts. They clog up fast this time of year, and a backed-up gutter just pushes water against your fascia and siding. That starts the whole cycle over again.
- If you've got heavy mold or green algae, water and pressure alone won't get it. Use a cleaning solution made for exterior surfaces. Stay away from straight bleach on painted or stained wood. It can fade the color and dry the wood out.
If you've got a pressure washer and a couple of hours, now's the time. You'll knock out the winter mess and the spring buildup before either one gets ahead of you.
If you don't have a pressure washer, or your weekend's already full, give me a call or reach out through my website. We handle this all the time and we'll get it done right without any risk to your paint or siding!
Dave Foster, Greystone Painting
540-622-7246
www.greystonepainting.com/contact