Understanding Mildew: What It Is and Why It’s Harmful

Chelsey Smith • July 21, 2025

When it comes to maintaining your home’s exterior, mildew is more than just an eyesore—it’s a problem that can affect your property’s value, safety, and structural integrity. At Clean Start Exteriors, we help homeowners fight back against mildew with professional power washing in Hamilton. But what exactly is mildew, and why is it such a big deal?

What Is Mildew?

Mildew is a specific type of fungus that thrives in moist, shaded, and poorly ventilated areas. It often appears as a thin, powdery layer of grey, white, or yellowish spots on surfaces like siding, decks, patios, and roofs. Unlike mold, which can grow thick and black, mildew tends to stay on the surface—making it easier to remove, but just as important to treat quickly.


Why Mildew Is Harmful to Your Home

1. It Weakens Exterior Surfaces

 Mildew may look harmless at first, but over time it can degrade materials like wood, vinyl, concrete, and brick. Left untreated, it can lead to rot, cracking, and costly repairs—especially on decks, fences, and siding.

2. It’s a Health Hazard

 Mildew spores can become airborne and enter your home, potentially triggering allergic reactions or respiratory issues, especially for people with asthma or sensitivities.

3. It Harms Curb Appeal

 A house coated in mildew looks dirty and poorly maintained, which can lower your property value and make a bad impression on guests or potential buyers.

4. It Spreads Fast

 Mildew spreads quickly under the right conditions, especially during Hamilton’s humid summers. A small patch can turn into a widespread problem in just a few weeks.


Why Power Washing Is the Solution

At Clean Start Exteriors, we specialize in power washing Hamilton homes to eliminate mildew and prevent it from coming back. Our professional-grade equipment uses high-pressure water and eco-friendly cleaners to safely blast away mildew from all exterior surfaces. It’s one of the fastest and most effective ways to restore your home’s appearance and protect it from damage.

Power washing not only removes mildew but also lifts away dirt, algae, mold, and other contaminants that cling to your home’s exterior. By scheduling regular cleanings, you can extend the life of your siding, deck, driveway, and more.


Don’t Wait Until It’s Too Late

If you’ve noticed discoloured patches on your siding, a musty smell outdoors, or slippery spots on your walkways, mildew could already be at work. Protect your investment with a professional power washing in Hamilton from Clean Start Exteriors.

Contact us today to schedule your free estimate and give your home the clean start it deserves.


Clean Start Exteriors – Your Local Power Washing Experts in Hamilton


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