The ornamental design for a footwearsanitizer, as shown and described.
FIG. 1 is a rear, left, and top perspective view of a footwear sanitizer including a case assembly including a blower that circulates air inside of the footwear and a light source that projects forward from the case assembly and emits light at a wavelength that prevents or inhibits the growth of microorganisms or destroys them;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a left elevation view thereof;
FIG. 5 is a right elevation view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a front elevation view thereof.
The broken lines showing the remainder of the footwear sanitizer depict environmental features. The broken lines within the claimed design depict ventilation openings in the case assembly and are for illustrative purposes only. None of the broken lines form a part of the claimed design. The boundary lines, shown in alternating long and short broken line segments, form no part of the claimed design.