Squeegeeing was the most difficult part of developing a robot that can clean windows, says Andria Remirez, member of a Rice University team that tackled the task of cleaning recessed windows as part of a WashBOT project. The team's system soaps the window with a sponge-like mop followed by a squeegee on a track. The next step that another team may tackle is moving the track down the window to the next area to clean.

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