FIG. 1 is a front perspective view of a portable car washing machine showing my design; the horizontal bar has been broken away for convenience of illustration;

FIG. 2 is a top plan view, the horizontal bar has been broken away for convenience of illustration;

FIG. 3 is an end elevational view thereof;

FIG. 4 is an opposite end elevational view thereof; and,

FIG. 5 is a side elevational view thereof.

The broken line showing of the car is for illlustrative purposes only and forms no part of the claimed design.