Overusing Bleach for Mold Removal

A lot of homeowners reach straight for bleach when they see mold, but evidence from the Environmental Protection Agency (EPA) shows that bleach isn’t effective for removing mold from porous surfaces like drywall or wood. In fact, bleach can cause mold spores to retreat deeper, making the problem worse over time.

According to a 2024 CDC report, bleach can also damage surfaces and release harmful fumes, especially in poorly ventilated spaces. The EPA specifically recommends using detergent and water on hard surfaces, and for porous materials, replacement might be necessary.

Many people believe they’re disinfecting thoroughly, but in reality, they’re risking their health and property value. If you want to get rid of mold for good, it’s best to follow science-backed guidelines instead of old cleaning myths.

Changing HVAC Filters Too Infrequently

Most people think changing their HVAC filter once or twice a year is enough, but according to the U.S. Department of Energy in 2023, clogged filters can reduce a system’s efficiency by up to 15%.

The DOE now recommends checking your filter every month, especially during heavy use, and replacing it at least every three months. Dirty filters not only drive up energy bills but also decrease indoor air quality, potentially worsening allergies and asthma.

Recent research highlights that 1 in 3 U.S. homes have HVAC systems running with overdue filter changes, often resulting in costlier repairs down the line.

While it might seem like you’re saving money by stretching out filter changes, you’re really putting your comfort and wallet at risk.

Power Washing Decks Incorrectly

It’s tempting to blast away grime on your deck with a power washer, but Consumer Reports and deck industry experts warn that using too much pressure can gouge wood and strip away protective finishes. A 2024 study by the North American Deck and Railing Association found that improper power washing is a leading cause of premature deck aging and surface damage.

The right approach is to use a lower pressure setting and a wide fan tip, starting at a safe distance and moving closer only as needed. Many DIYers aiming for a spotless look don’t realize they’re actually shaving years off their deck’s lifespan.

If you’re hoping to keep your deck looking great, gentle cleaning techniques are more effective and safer.

Using the Wrong Paint for Bathrooms

Choosing the wrong paint type for bathrooms is a common mistake, with recent surveys from paint manufacturers in 2023 showing more than 60% of homeowners opt for standard interior paint. Bathrooms need moisture-resistant paints, specifically those labeled as “bathroom” or “kitchen & bath” paints, which contain mildewcides and are engineered to withstand high humidity.

The American Coatings Association notes that improper paint selection is a top cause of peeling and visible mildew in modern homes. If you notice bubbling or dark spots on your bathroom walls, your paint might be to blame.

Always check the label and invest a little more upfront to save yourself repairs and headaches later.

Ignoring Gutter Cleaning Until Fall

It’s a common tradition to wait until autumn to clean gutters, but the National Association of Home Builders (NAHB) issued a 2024 advisory that spring and summer storms can clog gutters with leaves, nests, and debris just as badly. Blocked gutters are a leading cause of foundation water damage and roof leaks, costing U.S.

homeowners billions annually according to the Insurance Information Institute. Experts now recommend inspecting and cleaning gutters at least twice a year, and after major storms, to prevent expensive repairs.

Putting off this simple task puts your home’s structure at risk, even if you think you’re being efficient by waiting. Regular maintenance throughout the year is the new best practice.

Overtightening Plumbing Fixtures

Many people believe that tightening plumbing connections as much as possible will prevent leaks, but the International Association of Certified Home Inspectors explains that overtightening is actually the leading cause of cracked fittings and stripped threads. Recent plumbing studies in 2025 highlight that overtightened connections are three times more likely to leak over time because the stress warps gaskets and seals.

The trick is to tighten just until snug, then a quarter turn more—never force it. If you’ve ever dealt with a sudden leak or a broken fixture, overtightening could be the hidden culprit.

Smart, gentle installation is what protects your pipes, not brute strength.