Turn off the water at the mains and turn on the faucet to drain the water out of the system.
Place a bucket underneath the pipes leading to the faucet, unscrew all connecting pipes and remove clips using a screwdriver.
Unscrew the bolts holding the faucet in place using a wrench and remove the faucet.
Clean the faucet using a heavy-duty chrome cleaner and then sand using 220-grit sandpaper.
Cover the faucets in a layer of automotive primer. This is commonly found in aerosol form and should be sprayed on from a distance of 12 inches. Read the primer manufacturer's guidelines for specific instructions. Leave the primer to dry overnight.
Sand the faucets again so the paint will adhere better and leave a smoother finish.
Paint the faucet using an automotive spray paint or similar metal paint. Leave it to dry and apply a second coat.
Replace the faucets, tighten the bolts and clips holding them in place and reattach the pipes to the bath or basin.