Promptly cleaning a decorative concrete floor once the floor finish has become dirty, scuffed, marred or lost its luster (and dust mopping no longer helps) will restore the floor's initial gloss and help preserve the integrity of the remaining floor finish. You should use a pH-neutral cleaner, diluted in cool or cold water, according to the manufacturer’s instructions . Most pH-neutral cleaners do not require rinsing except when re-coating with new floor finish, because they do not contain strong acidic or alkaline additives. The best source of a good cleaning product is a local janitorial supply house. They'll also have the best prices. We use and recommend Spartan's Damp Mop Cleaner, as well as Diversey's Prominence.
When mopping, be sure to keep the cleaning solution from getting too dirty, and do not allow the cleaner to puddle. Sometimes, it helps to use separate buckets for the cleaning and rinsing solutions, and to periodically rinse the mop. Also, do not use Swiffer Wet-Jets, bleach, ammonia, Pine Sol, or any harsh detergents. These products will break down and discolor the existing floor finish and sometimes the concrete sealer, as well. This could then require stripping and re-application of the floor finish and sealer, which is a tedious, time-consuming, difficult and expensive process.
The ideal mop to use for damp mopping is a "loop end wet mop" made of a cotton/rayon blend or microfiber. Loop end mops are absorbent, re-usable, contact the floor surface continuously and don't leave lint or fiber behind. Microfiber flat mops also work well. Tough marks that do not come up with light pressure and a mop can often be removed with fine steel wool or a light scouring pad.