Copper test strips & electrode brush
Sunrock > Chest 1
A 30-count bottle of copper pool & spa test strips plus a small stiff wire brush for maintaining a solar pool ionizer. The strips read copper concentration; the brush scrubs mineral buildup off the ionizer's copper anode.
Wire tube brush on hex drill adapter
Sunrock > Garage > Black toolbox
Long cylindrical wire brush mounted on a hex-shank adapter so it can be chucked into a drill for scrubbing out bores, tubes, and other deep openings.
Drill-mounted wire wheel & abrasive discs
Sunrock > Garage > Black toolbox
Two drill-mounted rotary attachments: a crimped steel wire wheel brush and a coarse 3M abrasive stripping/cleaning disc, both on shanks sized for a drill chuck.