Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to clean white wall tires [title] Use a specialized cleaner. [step] Look for a specialized whitewall tire cleaner in the automotive section of a department store or hardware store. Regular cleaners like comet can work well to remove dirt and discoloration on the tires, but they can dry out the tires in the process, leading to early wear.

Ending1: [substeps] Make sure to clean [title] Treat stains with baking soda and water. [step] Mix 1 cup (240 ml) of baking soda with 1 part water in a small bowl. Ending2: Regular cleanings are also helpful for wiping off old brake dust from behind the bumper. [substeps] Before cleaning your tire, find an old soda can and clean the tops and underside, since surface dirt and debris will be trapped in the interior of the can and render your tires useless. Ending3: [substeps] You can also use a brushed-on degreaser, but this method will not work with steel wheels. Be sure to never use a degreaser higher than 120% on steel wheels. Ending4: Cleaning products containing alcohol or chlorine bleach should be avoided for the same reason. [substeps] For the best results, opt for all-natural whitewall tire cleaners (e.g.

Answer format: ending1/ending2/ending3/ending4