Home Repair Myths That Waste Renters' Time and Money

WD-40's name literally stands for "Water Displacement, 40th formula." It was designed to prevent rust and displace moisture, not to lubricate moving parts long-term. Applied to a squeaky hinge, it may quiet the noise for a few days, but the residue it leaves behind traps grime and can make the problem worse within weeks.

For hinges and door hardware, a small amount of white lithium grease or petroleum jelly is a more durable choice. For wood-on-wood squeaks in floors or furniture, dry lubricants like powdered graphite or even plain beeswax tend to outlast liquid sprays. See what's actually causing squeaky floors for a fuller breakdown.

Mould needs three things: moisture, a food source (like drywall paper or grout), and warmth. Paint provides none of the conditions that stop it. Even primers marketed as "mould-resistant" are designed to prevent mould on clean surfaces — not to remediate existing growth.

Small surface mould patches (typically less than 10 square feet, per EPA guidance) on non-porous surfaces like tile can often be cleaned with appropriate mould-removing products following label directions and with adequate ventilation. Porous materials like drywall with embedded mould growth generally require professional assessment. Always address the underlying moisture source first — whether that's a slow leak, poor ventilation, or condensation buildup.

Caustic drain cleaners generate heat as they react with the clog material. In older metal pipes — particularly in pre-1980s buildings — that heat and chemical reaction can accelerate corrosion. In PVC pipes, repeated use can soften joints over time.

For most common clogs, a drain snake (also called a drain auger) or even a simple combination of a cup plunger and manually removing visible debris from the drain opening works more reliably and without the chemical risk. Fixing a slow-draining sink without chemical cleaners walks through safer, effective steps in detail.

Caulk needs a clean, dry, stable surface to cure and bond correctly. Old caulk — especially if it's already cracking, peeling, or has any mould growth — is none of those things. New caulk layered on top will flex differently, delaminate along the old layer's edges, and typically begin failing within months rather than years.

The right process involves removing the old material completely using a plastic scraper or caulk remover tool, cleaning and drying the surface thoroughly, and only then applying a new bead. It's more work upfront, but the result lasts significantly longer. Resealing a bath or shower tray the right way covers the full process. Also see why caulk fails — and how to prep so it doesn't.

The fill valve and flapper inside a toilet tank are small, inexpensive parts that most renters can inspect and, with landlord permission, replace themselves. A running toilet is often caused by a worn flapper that no longer seals properly — a part that typically costs only a few dollars at a hardware store.

If you're a renter, report a running toilet in writing rather than ignoring it. In many states, landlords are responsible for keeping plumbing in working order, and documented reports protect you if water bills are disputed. The hidden causes of a running toilet explains what's likely going wrong and when a simple fix is realistic.