Can I reuse ceramic coating applicators and leveling towels?

Generally no. Coating residue cures inside applicator suede and towel fibers, making them stiff and potentially abrasive, and cured coating does not wash out. Most detailers treat coating applicators and leveling towels as single-use, or retire leveling towels to non-paint tasks. Plan for enough fresh towels before starting an application, since a stiff or saturated towel is one of the most common causes of streaks and high spots.