I'm new to wfp and I'm concerned that I'm not getting a proper rinse on some windows. Some of the windows the water runs off like a sheet, but others have areas where the glass seems to stay dry however much you try and soak it. Will these dry parts be clean. Also please offer some rinsing tips. I'm doing a zigzag, but I kind of think the glass aint getting a whole rinse this way. Thanks.