how do i clean my dewalt drill driver, can i use wd40 or something?

You want to avoid solvents like WD-40 on the non-metallic parts, as they can cause damage. Here's the safe way to do it.

1. Disconnect the battery pack from the tool.
2. Use clean, dry compressed air to blow dirt and dust out of all the air vents. Do this at least once a week if you use the tool regularly.
3. Wipe down the exterior with a dry or slightly damp cloth.

IF THAT DIDN'T WORK: For heavy grime on metal parts, you can use a mild soap and water solution on a cloth, but make sure no liquid gets inside the tool, especially near the trigger or motor vents. Dry it thoroughly before use.

HEADS UP: Always wear ANSI Z87.1 approved safety glasses when blowing out the vents. Never spray liquids directly into the tool or charger. For the charger, unplug it first, and never allow any liquid to get inside—it's a shock hazard.