Seachem Aquarium Cleaner is a multi-surface cleaner for use on the exterior of glass or acrylic surfaces of aquariums as well as other surfaces. Aquarium Cleaner does not contain ammonia and is perfect for safe use on and around aquariums or terrariums. Aquarium Cleaner dries quickly to leave a streak free clean surface. Directions Lightly pour small amounts of Seachem Aquarium Cleaner onto a cleaning cloth and wipe aquarium glass or other external surfaces clean. Repeat as necessary. For best results, use a lint free cloth. For wood finishes, use on an inconspicuous test area first to insure no reaction with stains or sealants on the wood. Though Aquarium Cleaner is safe for aquariums and terrariums do not use directly in aquarium or terrarium waters.