How to Clean a Garage Door (Metal, Wood or Painted)

Why the garage door matters

On many LA homes the garage door is the largest single surface facing the street. It catches dust, sprinkler spots, splashback from the driveway and road grime. When it looks dull, the whole front of the house looks tired, even if the walls are fine.

Cleaning it is usually simple. The key is matching the method to the material and avoiding pressure that can dent panels, strip finish or force water past the seals.

Steel and aluminum doors

Most modern garage doors are steel with a baked-on finish. Wash them with a mild car-wash soap or all-purpose cleaner and a soft brush or microfiber mitt. Work panel by panel, then rinse with a gentle spray from the top down.

If the door leaves a white or pale residue on your hand, the finish is oxidizing. Sun breaks down the paint over time, especially on south- and west-facing doors in the Valley heat. Washing removes the loose chalk, but the door may look a bit lighter afterward because you are seeing the faded paint underneath. A dedicated oxidation cleaner can help even it out. Heavy chalking usually means the door is a candidate for repainting, not a deeper clean.

Aluminum doors dent easily. Keep pressure low and the nozzle well back. Skip abrasive pads, scouring powders and strong solvents on any factory finish. They cut through the top layer of paint, and once it is scratched the door oxidizes faster in the sun.

Wood doors

Wood garage doors are beautiful and demanding. Pressure raises the grain, splinters soft spots and can strip stain unevenly. Clean them by hand with a mild wood-safe cleaner and a soft brush, following the grain, and rinse gently.

If the wood has turned gray, the finish has worn through and the sun is breaking down the surface fibers. Cleaning can brighten it some, but a gray door usually needs a wood brightener and a fresh coat of stain or sealer to look right. That is a refinishing job more than a washing job.

Clean wood doors in the shade or early in the day so the cleaner does not dry on the surface and leave blotches. Let the door dry fully, at least a day or two in dry weather, before applying any new finish.

Painted and composite doors

Painted doors, whether wood, fiberglass or composite, clean like the walls of a house. A soft wash with a mild solution, a few minutes of dwell time, then a top-down rinse. Avoid scrubbing hard on old paint, which can burnish or lift it.

Pay attention to the bottom panel. It collects the most dirt and is often where mildew grows on the shaded side. It may need a second pass.

Don't forget seals, tracks and windows

The rubber seal along the bottom and the weatherstripping on the sides keep dust, water and pests out. Wipe them clean with soapy water and avoid aiming a spray at them, which can push water into the garage and dry out the rubber faster. If a seal is cracked or flattened, replacing it is inexpensive and makes a noticeable difference.

Garage door windows are often acrylic, which scratches more easily than glass. Rinse grit off before wiping, then use a soft cloth. Leave the tracks, springs and opener hardware alone during washing. Those are mechanical parts, and spring work in particular is a job for a garage door technician.

If you see rust starting at the bottom edge of a steel door, clean and dry it, then spot-prime and paint it soon. That edge sits close to wet concrete and sprinkler spray, and rust there tends to spread along the panel.

Pair it with the driveway

A clean door in front of a stained driveway still looks unfinished. The two are usually cleaned together, and it makes sense to wash the door first so its runoff lands on concrete that is about to be cleaned. Our front entry curb appeal guide covers the rest of the street-facing checklist.

At Say Wash It the garage door is washed as part of a house wash, which is $0.35 per square foot of exterior wall as of October 2026. Driveway cleaning is $0.50 per square foot, and booking both together earns a 5% bundle discount. The instant quote on this page shows the total.