Care and feeding of patinaed, bronze sculpture:

The primary maintenance is a yearly waxing. If the piece is outside, handled, cleaned or in the sun with any regularity it would be wise to wax more often. It cannot be waxed too much.
Any carnauba paste wax would suffice; I personally use “Johnson’s paste wax.” It’s cheap and available at most hardware stores. Harder and more resilient waxes may be available at some art supply stores where bronze-casting materials can be found.
The waxing process is similar to that of a car. The wax is rubbed on with a soft cloth, allowed to harden just to the point where it doesn’t smear when rubbed off with a clean terry cloth. Then rub the wax off vigorously with a clean terry cloth until it gains a smooth luster. Repeat wax and buff at least once if not a few times. The more coats the more it shines.
Fountains will always have mineral deposits and discoloration near the water line and anywhere water touches regularly. Highly filtered or distilled water will reduce this. Light rubbing can sometimes remove a percentage of buildup.

If the piece has un-patinaed surfaces they will tarnish over time. If it were your desire to keep these as bright and shiny as possible I would recommend bringing the piece back to me for surfacing. Any slip of the abrasive pads could scratch and metal polishes damage the patina.
If you already have scratches or abrasions that need attention these can be tended too as well. Contact me for advice or repair.

Do caution against exposing the piece to extreme ph. Acids or bases will affect patina. Cat urine in particular will greatly affect patina without chance of repair.

Care of painted and coated sculpture:

Most steel sculptures of mine are painted with a durable, washable paint and intended for outdoor installation. These can be washed like a car for dirt and foliage. A pressure washer can disturb cracked paint but is otherwise fine.
Care is the same for a powder coated or galvanized piece.