Mildew on window frames and sills

Quick answer: Mildew on window frames, sills and slider tracks is caused by humidity, shade and trapped moisture, and it's common on the Treasure Coast, especially on north-facing windows and inside lanai enclosures. It's cleaned as part of a full window clean; the long-term fix is better drainage in the track, airflow, and regular cleaning. Call or text 772-243-1234.

Why frames mildew here

Humidity sits in slider tracks and on sills, north-facing frames stay shaded and damp, and lanai enclosures trap moist air. Mildew grows on the film of dust and pollen that collects on those surfaces. It's cosmetic on aluminum and vinyl, but it spreads to the glass edges and looks like neglect.

How we clean it

Frames, sills and tracks are scrubbed and wiped as part of every home clean. Mildew on frames comes off with cleaning solution and a brush; we don't use bleach against the glass because it can affect seals and any window film. Heavy mildew on stucco around a window is pressure-washing territory, not ours, and we'll say so.

Slowing it down

Keep slider tracks clear so water drains rather than pools. Trim landscaping that shades and crowds windows. Put frames and sills on the same schedule as the glass so the dust film mildew grows on never builds.

Lanai enclosure frames

The aluminum frame of a pool cage mildews on the shaded side and along the bottom rail where water sits. That's outside our window-cleaning scope; it's a soft-wash job for a pressure-washing company. We'll point it out, and we recommend having the cage washed before the window clean so nothing drips onto the finished glass.