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Tips for Maintaining and Cleaning Fiberglass Windows
Tips for Maintaining and Cleaning Fiberglass Windows
11/Apr/2025

If you’ve recently moved into a newer home or replaced your windows in the last decade, then there’s a good chance you’ve got fiberglass windows. Unlike old-school wood or vinyl windows, fiberglass frames are sleek, strong, and super low-maintenance - but “low-maintenance” does not mean no maintenance.

Tips for Maintaining and Cleaning Fiberglass Windows

To help keep your fiberglass windows looking great and working properly for the long haul, we’ve put together this easy guide to identifying, cleaning, and caring for them. If you ever run into issues that need more than elbow grease, our team at Mr. Handyman is always ready to help.

Mr. Handyman is proud to offer a wide range of home improvement services, including window repair and replacement. Call or message us today to learn more about our services.

First Things First: Are Your Windows Fiberglass?

Not sure if you’ve got fiberglass windows? You’re not alone. They’re often mistaken for wood or metal because they’re painted or finished in similar ways. Here's how to tell:

  • The look: Fiberglass frames are smooth, rigid, and often painted. They can mimic the appearance of wood, but won’t have any grain or knots.
  • The feel: Tap the frame. Fiberglass has a surface which is much sturdier than vinyl and more consistent than wood.
  • The flex test: Vinyl frames can bend slightly under pressure. Fiberglass doesn’t flex; it stays firm.
  • Check the labels: Most manufacturers list materials near the edge of the glass or in the window sash.

If they’re fiberglass, then good news: you’ve got one of the most durable window materials on the market.

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Why Fiberglass Windows Are Worth Caring For

Fiberglass windows are prized for their strength, insulation, and weather resistance. Like for anything in your home, a little attention goes a long way in keeping them at their best. Dirt buildup, hardware wear, or poor drainage can shorten their lifespan or affect functionality. Plus, clean windows just look better.

How to Properly Clean Fiberglass Window Frames

We're going to keep it simple here; no need for special products or complicated routines here.

  • First and foremost, use a dry microfiber cloth or vacuum brush to wipe down the window frames. This helps remove loose dust, pollen, and cobwebs without smearing dirt around.
  • Next, we'll need a gentle cleaning solution. Skip the harsh chemicals. All you'll need is warm water and a few drops of mild dish soap. Stir it together in a bucket or spray bottle.
  • Now, grab a soft cloth and dip it in the solution. Gently scrub the window frame and make sure to get in the corners and around the sills. Avoid abrasive pads or brushes that could damage the paint or finish.
  • Finally, wipe off any soap residue with a clean damp cloth. Then dry the area with a lint-free towel to prevent streaks or mineral spots.

Maintenance Tips to Keep Fiberglass Windows Working Like New

Clean windows are just the start. If you want windows that are as functional as they are attractive, then consider these simple habits:

  • Once or twice a year, inspect the edges where your windows meet the siding. If you see cracks or separation in the caulking, it’s time for a touch-up.
  • Window locks, tracks, and hinges can collect dust or get stiff over time. A quick spray of silicone-based lubricant helps keep everything moving smoothly.
  • Most windows have small weep holes near the bottom frame to let water drain. Make sure they’re not blocked with dirt or debris.
  • Even if you don’t use certain windows often, open and close them a few times each season to keep the mechanisms from sticking or seizing up over time.

These simple measures can save you from unexpected and costly window repair. If the damage is done, then keep calm and call Mr. Handyman for affordable and reliable service.

When to Call Mr. Handyman for a Pro

Despite your best efforts, things can go wrong. Fogged glass, stuck sashes, cracked frames, and air leaks that just won’t quit are some that come to mind. That's where Mr. Handyman comes in.

At Mr. Handyman, our background-checked and uniformed handyman team has decades of experience with window repair and replacement. Whether you're dealing with a minor issue or need a full replacement, our handyman will walk you through your options, keep you updated throughout the process, and guarantee our work for a full year.

Still have questions? Call or message Mr. Handyman to get in touch with a courteous member of our team today. We have office staff who are always ready to address questions or concerns.

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