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Strap-Hung Shower Head Descaling Soak Cup
A rigid 112 mm OD × 50 mm deep cup that holds about 440 ml of vinegar. It soaks a fixed shower head with a face up to about 100 mm without taking the head off the arm. Two side lugs have 22 × 5 mm slots for a 20 mm hook-and-loop strap, a rubber band or a cord that goes over the shower arm, so the cup self-centres under the head whatever the arm's angle. It replaces the leaky plastic-bag-and-rubber-band trick, and a notch in the rim lets you pour the vinegar back out cleanly.
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