Step 1- apply WD40 to a clean toothbrush and rub it on the rust Step-2 Let the WD40 soak in for 15 min, then wipe it off with an old cotton under shirt. Step 3- apply Weiman Metal Polish with a toothbrush. This polish is sold in grocery stores,next to the silver polish. Let it marinade for 15 to 30 min. Brush it off with a clean toothbrush. If you have to go more abrasive to get some stubborn rust off,use a soft brass wire brush that looks like a toothbrush,and Weiman Metal Polish. This polish will prevent rust too. If you have rim brakes,use a solvent to remove the polish from the brake contact area on the sides of the rim.