AQQA Magnet Fish Tank Aquarium Glass Cleaner, Strong, XL, for 1.0-2.5cm Glass

AQQA Magnet Fish Tank Glass Cleaner, Upgrade Strong Aquarium Glass Cleaner Magnet, Fish Tank Glass/Acrylic Cleaner with 2 Detachable Scrapers for Cleaning Algae, XL, 1.0-2.5cm glass thicknesses. The inner cleaner floats automatically when detached, allowing easy retrieval without wetting your hands or disturbing fish and aquatic plants.

eBay