On the actual can, it does in fact say that it "cleans... water deposits." So we first opened the window, and turned on the fan (experience has shown that WD-40 fumes can be scary!) Then we sprayed down the door,waited a few minutes, then wiped it off. The results were mixed. We noticed that it did get rid of any deposits on anything that was metal, but on the glass part itself, not so much. We're not sure if perhaps we should have employed a certain technique, or maybe it needed more time to sit and disolve... Has anyone else tried this or had success? Does anyone have any other tips for getting rid of water stains on shower doors? Please share in the comments?