Best refill
TUYU Spin Scrubber Replacement Brush Heads, 7-Piece Kit
Dome, large flat, small flat and corner brushes plus scouring, copy-wool and absorbent pads.
$19.99★★★★☆ 4.5 (116)
spin scrubber replacement brush heads
Bristles wear, pads thin out, and a brush head that has done a hundred showers is ready to retire. These replacement brush heads refill your spin scrubber with a fresh set on the common 56 mm socket.

Best refill
Dome, large flat, small flat and corner brushes plus scouring, copy-wool and absorbent pads.
Replace a head every few months, or when the bristles splay or stop springing back. Check the 56 mm socket if your scrubber is not a TUYU.
Fits every TUYU scrubber: 8-head kit, 4-head kit, Full-body IPX7. How-to: replace a brush head.
Many 56 mm spin scrubbers, yes. Measure your drive first.