Locate and remove the hinge pin in order to effectively lubricate the hinge.
Using pliers, grip the pin and rotate it counterclockwise gradually to pull it out.
Use a paper towel or microfiber cloth to clean the grime, grease, rust from the plates and the pin.
Once clean, give it another coat of lubricant to protect from rusting.
Assemble the hinge back, and open and close the piano lid to ensure the lubricant is seeped through any cracks.
Spray another coat of lubricant on the hinge and wipe excess to finish.
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