To carry out a high lift work easily by fitting a tip installation jig to the tip of a hollow FRP pole connecting an add type or a shake out type to the add type attachably/detachably.

FRP pole 1 is formed by connecting plural FRP pipes 2 in order. The ball joint 3 of the FRP pipe 2 is connected by using a adding tool inserted in the FRP pipe 2. A washer consisting of a water washing cloth and dirt remover is installed on the tip of the FRP pole 1 as a tip installation jig 10. The dirt on a glass surface is washed while moving the water washing cloth containing the water vertically along a glass surface and then the dirt water on the glass surface is wiped off by moving the dirt remover vertically after turning the FRP pole 1 reversely. Lastly, in order to remove the dirt left on a window frame, the washer is removed and in place of that, the dirt is wiped off by installing a wipe off cloth and the work is finished.