The ornamental design for a detachablesnowbrush, as shown and described.
FIG. 1 is a right side elevational view, the left side being a mirror image of same;
FIG. 2 is a top plan view of the brush of FIG. 1;
FIG. 3 is a rear elevational view of same;
FIG. 4 is a front elevational view of same;
FIG. 5 is a top perspective view; and,
FIG. 6 is an exploded top perspective view of the brush of FIG. 5.
The elements shown in broken lines in FIG. 4 are included for the purpose of illustrating portions of the article that form no part of the claimed design.