The Wash Cloth
One for every day of the week.
You shouldn't use the same cloth in the shower on multiple days. Seven cloths, one week.
Cotton and sisal, in an open weave. It's the texture that does the work — not a scrub, and nothing to rinse away. Use it with The Wash, or with The Face Oil on the days your skin asks for it.
9 × 9 inches, with a loop to hang it. It dries between uses, which is half the point.