Glass is fragile and all pieces should be handled with care. To clean your glass, use a soft cloth and wipe gently. If you must use a cleaner, make sure to use an ammonia-free household glass cleaner. Do not clean with an abrasive material as it will remove or scratch the patina on the metal. Never use vinegar, windex or any acid-based cleanser, as these can destroy the lead or solder that is holding the piece together.