There is a bedding in period, because the fine jets of H20 used on the windows and frames are cleaned right into every corner. As a result of this, the first 2-3 cleans you may notice a small amount of residue remaining. This runs from the dirty frames and we please ask you to be patient as this is unfortunately unavoidable. Once the frames are cleaned 2-3 times and the bedding period passed the new method will actually clean to a better standard than before.