How to Clean Window Tracks and Sills

Window tracks collect dust, dirt, dead insects and mildew, and they're often forgotten when cleaning windows. Dirty tracks can make windows hard to slide. Here's a quick method.

What You'll Need

• A vacuum with a crevice tool
• Baking soda
• White vinegar in a spray bottle
• An old toothbrush or small brush
• Cotton swabs or a butter knife wrapped in a cloth
• Paper towels or microfiber cloths

Step 1: Vacuum Loose Dirt

Open the window and vacuum the tracks with the crevice tool.

Step 2: Add Baking Soda and Vinegar

Sprinkle baking soda into the tracks. Spray with vinegar. Let it fizz and sit for 5–10 minutes to loosen grime.

Step 3: Scrub

Scrub the tracks with an old toothbrush, especially the corners.

Step 4: Wipe Clean

Wrap a cloth around a butter knife or use cotton swabs to get into narrow grooves. Wipe until the tracks are clean.

Step 5: Clean the Sill

Wipe the window sill with warm soapy water. For wooden sills, use a barely damp cloth and dry immediately.

Mold or Mildew

If you see black spots, use a mildew cleaner suitable for the surface, following the label. Make sure the area dries fully afterward.

Keep Tracks Clean

• Vacuum tracks every month or two.
• Wipe condensation off sills in winter.
• Check that weep holes (small drainage holes) aren't blocked.

FAQ

Why won't my window slide smoothly? Dirt in the tracks is a common cause. Clean them, then apply a silicone lubricant made for windows.

Can I use bleach? Only on surfaces it's safe for, and never mix it with vinegar.