Ruler rules
Clean acrylic rulers with a soft cloth and a mild soap-and-water solution. Don’t use solvents, abrasives, or alcohols to clean rulers as they may damage the acrylic or fade the ruler markings. Some of my rulers get a used-tape residue because I highlight certain measurement marks with tape. For these, I squirt dish soap directly on the stickiness and allow it to sit for a half hour or so, then I rinse it off under warm water while I rub the area with my fingertips. It works like a charm.