Sheetrock almost always involves a messy installation, and despite any precautionary measures to keep the area clean, most installers can attest to the possibility of sheetrock mud finding its way to the floor below. Most of the time, the mud is easily cleaned up before it has a chance to dry. In a situation where the mud has dried, it is easy enough for almost anyone to remove using basic household materials.
Chip away the chunk of sheetrock mud from the floor using the plastic putty knife.
Mix dish soap and water in the small bucket, 1 part soap to 5 parts water or as indicated on soap packaging.
Scrub any sheetrock mud residue using the steel sponge and soapy water, or the rough side of a two-sided dish sponge for polished concrete floors. You may have to let the muddy residue soak for a few minutes before it can be completely removed.
Repeat Steps 1 through 3 on any remaining spots.