FIG. 1 is a perspective view of a floor cleaning device showing the new design;

FIG. 2 is a left side view thereof, the right side view thereof being a mirror image of the left side view shown view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof.

The broken line showing of the circular area on the top surface of the head, a connector, and handle is included for the purpose of illustrating portions of the article that form no part of the claimed design. The surface shading illustrated in the drawings is provided merely to highlight the contour of the design and is not intended to be illustrative texture or gloss.