I would pop the push caps off wheels and disassemble the legs, triangle. Hit everything with steel wool and reassemble. The plastic cover of the push cap will probably come off leaving the retaining ring on the triangle. If you're careful, you can use a pair of needlenose or regular pliers to pry if off w/out snapping it. You then can reinsert the retaining ring (note the direction of the little "tangs" into the groove inside the push cap using a screwdriver. Good as new!