Electric Bathroom Cleaning Brush, Cordless Spin Scrubber Full Body Waterproof IPX7 with Adjustable Handle, 8 Replaceable Brush Heads for Bathtub/Kitchen/Window/Home -SD-CTB01

Instead of getting a scrub attachment for a heavy drill, you can get an electric cleaning brush. There are lots on Amazon and you can check the weight in the listing info This one for example is 14oz :)

Thisscrub brush is great! And $35.