The Piano Technicians Guild site has many well written articles on the care of the piano. I've included links to some of the most relevant below.
Basic Rules of Piano Care
How Should I Take Care of My Piano?
The Special Care and Maintenance of the Teaching Piano
How often should my piano be serviced?
The following link has an excellent article on how to care for the finish on your piano.
Finish Care Bulletin
Basic Rules of Piano Care
How Should I Take Care of My Piano?
The Special Care and Maintenance of the Teaching Piano
How often should my piano be serviced?
The following link has an excellent article on how to care for the finish on your piano.
Finish Care Bulletin