Hi Larry,
just in case, I found the answer, hopefully you already have too. Thank you so much Mrjhealth!
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