Billoz and Rosskesava,
Ignore the two handed technique, thats advanced stuff and can't be used on all windows all of the time.
When you start off with the squeegee, if you are right handed, put the squeegee onto the glass on the left hand side of the pane,
Start several inches below the top of the pane.
Make sure the blade starts on the glass almost horizontal.
slide the squeegee up to the top left hand corner of the glass, making sure that as you do so the bottom edge of the squeegee is very nearly parallal to the left hand vertical edge off the glass.
As you draw the squeegee from left to right along the glass, ensure that by the time that the top leading edge of the squeegee reaches the right hand corner of the glass, that the trailing edge of the squeegee is almost parallel with the top edge of the glass.
That little bit is important!!!
Don't wait until you are almost all the way across the glass before you try to get the squeegee horizontal with the top of the window pane!!
you should not have to try and twist the squeegee into this position at the last minute, this is the point you will get the 'kicks' on the glass that leave the marks.
As you begin to draw the squeegee down the glass, allow the leading edge of the blade to drop very quickly into the vertical position, allow the squeegee to continue rotating through this point, when you have rotated past 180 degree's you are then ready to through the process going the other direction from right to left!
But before you have gone all the way across, yet again ensure you have allowed the trailing edge of the squeegee to have lifted to the point where the blade is horizontal!!
God knows if that little description will help you
Ian