This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to keep tires black
Rinse off caked-on dirt on your tires using a hose.
If you don't have a hose at home, go to a local carwash and use theirs. Spray down the surface of all your tires.

Choices: (1). Use a sponge and water to spread anti-stickiness. Rinse the area well between washes to don't leave trace of streaks. (2). If you notice any tough dirt spots, move the hose closer to the tire so the stream of water is more powerful. Spray the surface of your tires with a cleaner. (3). You can water them gently, but you don't want water on them. If your tires are caked on, take out your tire pads and rinse off all the dirt. (4). Leave at least 0.5 inches (1.3 cm) of space between them. Wipe down the surface of your tires (the ones on the outside) and clear out any debris.
The answer is:
(2).