Hanging your artwork:
Watercolour paintings and art prints should not be placed in direct sunlight or near direct sources of heat or air conditioning. Ideally, they should not be exposed to challenging environments such as bathrooms or kitchens. If you light your prints, do so only when you wish to display them. The high intensity light will take a toll on them.
Watercolour paintings and art prints should be placed behind UV blocking glass or at least regular glass. They should be mounted with acid free materials and archival techniques. The artwork should not contact the glass, when mounted. The best rule of thumb is that you should treat your reproductions as if they were originals.
Cleaning your artwork:
The glass over your artwork can be lightly dusted with a “Swiffer” type device or even sprayed with an aerosol duster. If your back is to the wall and you must use liquid to clean the glass, spray very light amounts of a household glass cleaner on a soft, absorbent cloth and apply the cleaner to the glass with the cloth to avoid allowing any moisture to get behind the glass. Never spray glass cleaner on the glass.
A light dusting is always possible, but should not be required more than once every couple of years.
Storing your artwork:
When not hanging, store paintings and prints standing upright, not stacked, with protection surrounding them. Do not put in spaces that are not temperature and humidity controlled, like unfinished basements, attics or garages.