Remove the hardware from the doors with a screwdriver. Place the screws in a plastic bag to keep them together.
Soak the hardware in a slow-cooker with water and dish soap. Turn the slow-cooker on medium and wait a few hours. Check the hardware. If some stubborn paint remains, let it soak a little longer.
Dry off the hardware with a soft cloth. Make sure you get into tiny nooks and crannies and that the entire piece is dry.
Line up the hardware on a cardboard sheet. It is best to do this outside to avoid over-spraying.
Spray-paint the hardware with a metal paint. Use the color of your choice. Spray on a light coating. If necessary, flip the hardware over and coat the other side. Let this coat dry for four to six hours. Apply a second coat if necessary and allow to dry completely.
Reattach the hardware with a screwdriver. Replace the handles back on the door and tighten the screws.