Countertop dishwasher

FIG. 1 is a front perspective view of a countertop dishwasher according to a second embodiment of our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a front bottom perspective view thereof.

The broken lines shown in the drawings illustrate portions of the countertop dishwasher that form no part of the claimed design or environmental structure that forms no part of the claimed design. The wavy broken lines on the top surface of the countertop dishwasher in FIGS. 1-8 represent the disclaimed surface contours of the top surface.