To prevent a shaking between a channel part and a handle part from occurring by a method wherein the fitting part of the channel part is inserted in the recess of the handle part, and a squeegee is constituted in such a manner that by simply rotating the channel part, the channel part can be surely held by the handle part.

The base end part of a channel part 1 is made to be an approx. triangular fitting part 1a. A recessed part 2a of a handle part 2 is made into an approx. triangular shape as well, and one of walls 2b of the recessed part 2a of the handle part 2 is comparatively thin, and at the tip end of the wall 2b, a protruding part 2c which protrudes into the recessed part 2a is formed. The fitting part 1a of the channel 1 is inserted in the recessed part 2a of the handle part 2, and the channel part 1 is rotated clockwise. By this motion, the recessed part 2a is slightly expanded since one of the walls 2b of the recessed part 2a is comparatively thinly formed, and the channel part 1 becomes relatively rotatable to the handle part 2, and the channel part 1 can be surely held by the handle part 2.