If you choose to use old towels, wash them first in cold water and fabric softener. A WEEK Brake dust, dirt and tar build up can dry out tires, shortening their life. Use an old toothbrush to really clean tire crevices and tread. Remember to dress them once they're clean with something like ArmorAll to add a protective coating. These are too abrasive.
Colored waxes are just as bad.
If the wax never dries completely, it can become a magnet for more dirt. However, don't use any product or homemade solution with ammonia, which can cause permanent discoloration especially if you have leather interiors. Use a carpet cleaner and a damp sponge. This will help avoid streaks. If your car needs something specific done, mention it.