If your sculpture needs a little cleaning from time to time it doesn’t get much easier! You can clean your sculpture with damp rag, or if preferred you can dampen a rag with window cleaner to really bring out the shine.
We do recommend that you bring your sculptures in or cover them during the worst months of winter. Particularly with any bowl shaped sculptures, or shapes which can hold water, due to the amount of force exerted by water when it freezes.
Treat you sculptures well and they will treat you well. If it is highly painted piece, treat is as if it were a fancy car with a custom paint job, don't scratch it with a key, or leave it in Full-Sun 365 days a year, but place it part sun/shade and take it in for the harsh winter months. Of course almost anything can always be repaired as well.