The ornamental design for a rotatabletubescrubber, as shown and described
.
FIG. 1 is a perspective view of the rotatable tube scrubber showing my new
design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof, the rear and opposite sides
being identical in appearance;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a top plan view of an alternate embodiment of the rotatable tube
scrubber showing my new design, this embodiment being identical to the
first except for the four circles shown on the head.