To use a magnetic glass/acrylic cleaner, place the side with the scrubbing pad in your tank, facing the glass. Then attach the magnetic handle from the outside. It may take some practice to get everything to line up correctly. As with all scrubbers, be sure to check your scrubbing pad for any debris before attaching it to your tank wall, since gravel or other coarse objects stuck in the scrubber pad could damage your glass or acrylic walls. The easiest method for separating the exterior handle and the interior scrubber is typically by twisting—rather than pulling—them apart, lessening the magnetic contact surface area.