I've been developing my own 120 black and white film for a while now and the only problem I can see is that when I scan them into my computer with my film scanner, there are always these little white dots and "scratches" on my pictures. I cannot see them with my naked eye on my film (I've help them up to the light repeatedly trying to find them) but whenever I scan, there they are. I am not doing anything wrong or particular when developing so I'm really curious as to what is causing them. The only thing I can think of is that dust is popping up somewhere along the line, but I really have no idea how. I try to be incredibly careful but they're always there. I also thought it might be because of my camera being dusty but I blew out just about every spec of dust in my camera and lens so that shouldn't be the cause of so many little dots. To be more specific, I'm attaching a picture of what a part of my scanned film looks like. Is there anything I can do to prevent these from appearing? They're not horrible but they're really, really annoying. I find it unusual that they also only seem to appear in big open spaces on my film -- i.e. skies. Thank you for any recommendations or help.