1. Turn the water off completely to the unit.
2. Under handle, at the 6 o’clock position, is an allen screw. Use a #3 allen wrench to completely remove the screw.
3. Use the handle to remove the valve.
4. Soak the valve in vinegar.
5. While the valve is soaking, crack the water back on to the unit and flush the faucet body.
6. Re-install the valve in the body with the handle, lining up the holes for the allen screw.
7. Replace the allen screw.
If the customer has already removed the handle from the valve:
1. The black plastic valve guard must be lined up at 6 and 12 o’clock position (1/2 of the plastic guard is raised, that raised part must be lined up correctly) before re-installing the handle on the valve.
2. Replace the allen screw.