I use a stanley blade laid at an angle to the rim and spin the wheel, obviously still fitted to the bike, lol.
Another thing you may not know Guys, the stamping on the rim 'SKYWAY PATNo.0000000' does not disappear. It is merely filled when the brake pads rub over it so, if you know where it is located, you can carefully dig out the brake pad residue with a stanley blade, or other small sharp object