To get rid of raindrop marks on windscreen, got to the aircraft folder, you will need to do this for all 3 variants,
Normall Aircraft/X-Aviation/Saab 340.
Objects folder, find the " Rain.obj " file, open with a text editor.
Delete everything after, IDX10 41082 41080 41082 41083 41084 41085 41086 41084 41086 41087, thats the last row, so should be # wiper2 down, delete and than save. Youll have clean glass