What should be done before the floor dries after cleaning?

Mopping with clean water until no residue shows on the hand is the correct approach because it ensures the surface is left free of cleaning solution residue, which can contribute to slippery conditions or detract from the floor's finish. This method helps to achieve a thoroughly clean surface, providing a safer environment and enhancing the longevity of the flooring.

When the floor is mopped with clean water, it effectively removes any remaining cleaning agents that could be harmful if left behind, especially in high-traffic areas. The focus is on achieving cleanliness while also prioritizing safety by ensuring the floor is not left with any potential slip hazards.

Other methods may not adequately remove residues or may compromise the cleaning process. For instance, simply letting the floor air dry could leave behind dirt and cleaning agents, negating the benefits of the initial cleaning. Buffing the floor may also not address any lingering residues effectively before the floor dries. Therefore, ensuring the surface is clean and free from any substance before it dries is crucial.