Unplug the Shark steam mop.
Lay the mop on the floor, a counter top or table. Line up the mop head with the bottom of the unit.
Push the mop head onto the unit until you hear a soft click indicating that the mop head has locked into place.
Place the Shark steam mop flat on the floor or counter top.
Turn the water tank cap counter clockwise to remove it. Set it aside.
Pour 1/4 cup of vinegar into the filling flask. Fill it up the rest of the way with water.
Pour the water-vinegar solution into the water tank until it reaches the tank opening or maximum water-level mark.
Replace the water tank cap.
Plug the unit in and turn it on. Allow it to sit for 30 seconds.
Release the handle and begin mopping back and forth to release the steam.
Replace the mop head with a clean one if dirt begins building up on it, leaving streaks on the floor.
Turn the unit off and unplug it once you have finished mopping. Remove the mop head and wash and dry it.