Objective: how to clean a garage floor

Which of the following solutions is more sound in terms of naive physics reasoning?

(I) Remove any moss or roots that have grown on exterior concrete. Spray the concrete. Cover the floor with a dusting of cleaner. Scrub the floor. Rinse the concrete with clean water.; (II) Remove any moss or roots that have grown on exterior concrete. Spray the concrete. Cover the floor with a dusting of cleaner. Scrub the refrigerator Rinse the concrete with clean water.;
(I)