Keep the air filter running during cleanup to trap loose powder.
Turn off the control box.
Detach the cup, return remaining powder to your supply, then wash and dry thoroughly. Store the cup upside-down on the conical drying rack next to the control box.
Detach the air hose from the control box. With the air filter running, use the air hose in a sweeping motion to push any loose powder towards the filter at the back of the booth.
Place the gun on the floor and oriented towards the rear wall, then use the air hose to blow air into the intake of the powder gun (the larger opening in the cup mount) for 2-3 seconds to eject remaining powder from the line.
Using a slightly damp paper towel, wipe down any loose powder on the ground clamp, cable, and all surfaces of the powder gun and its hoses. Holster the powder gun.
Use the shop vac to clean up any remaining loose powder from the filter, booth walls, floor, powder cup mount area, ground clamp and cable, and anywhere else you find it.
Turn off the booth light and the air filtration system, and tidy up any cables.