If you wish to clean your crystal chandelier yourself, there are two ways that we recommend. The first way is to use the spray cleaning solution that we sell in-store. The directions are clearly printed on the bottle. The second is to mix your own cleaning solution, from warm water and a small amount of dishwashing liquid, and put into a spray bottle. In either case, some precautions must be taken. Your light must be turned off and the bulbs must be completely cool to the touch before you start (but do not remove them from the fixture). Spread towels or plastic sheeting underneath before you spray the solution you are using onto the fixture. After you spray your chandelier with the solution, you may let it drip dry or wipe with a clean, dry cloth (not paper towels as it will leave lint) and then spray it with warm water following spraying it with the mixture. The primary concern while cleaning your fixture is that you do not want to damage the finish of the frame, therefore, do not use acidic solutions (vinegar) nor strong cleansers (ammonia, bleach etc). The other thing to keep in mind while cleaning your fixture is to NOT TURN THE FIXTURE WHILE CLEANING IT, as this will loosen the connection that is holding the fixture onto the ceiling.
If you do not want to clean the fixture yourself, there are some companies that specialize in fixture cleaning. You can check online to see if there is a professional cleaning service located in your area.