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
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Reviews Page www.derekgibsonpiano.com/reviews.html

​Services and Prices Page www.derekgibsonpiano.com/services.html

FAQ Page www.derekgibsonpiano.com/faq.html

Links Page www.derekgibsonpiano.com/links.html

How the Piano Works www.derekgibsonpiano.com/inner-workings-of-the-piano.html