I use fan jets all the time,better and quicker for rinseing on both types off glass,I just can't get on with pencil jets as they seem to take ages rinseing on windows that bead,fan jets however need more attention especially on the top part of the window when rinseing but can get perfect results with a bit of practice,I find they save water and give a proper rinse on both type of windows,I have a tap on my hose connected to my belt that saves even more water.
Pencil and fan jets are a preverence thing but I can't get on with the pencil ones
