How to Clean a Casement Window Mechanism

Open your casement windows as far as they will go. Remove the screws holding the arm in place and set them aside in a small bowl.

Remove the crank handle. This process differs between window brands, so you will have to examine the crank handle to see how it is attached to the crank mechanism.

Clean the inside of the crank handle seating with a small toothbrush. Clean any dust or dried-out lubricant on the crank arm with a wire brush.

Soak the crank handle, crankshaft and both parts of the arm mechanism in hot water that has a squirt of dish liquid dissolved in it. Dry all of the parts thoroughly with lint-free shop cloths.

Lubricate the crankshaft and arm mechanism with the same type of lubricant that was originally used. This is usually automotive grease rather than a spray lubricant.

Scrub the screws with a toothbrush to make sure there is no dust or grease embedded in the threads and reassemble the arm mechanism. Replace the crank handle on the shaft.

Lubricate the crank shaft and arm mechanism with the same type of lubricant that was originally used. This is usually automotive grease rather than a spray lubricant.

Scrub the screws with a toothbrush to make sure there is no dust or grease embedded in the threads and reassemble the arm mechanism. Replace the crank handle on the shaft.