Never use a squeegee on film, always use one (lightly) on paper.

After washing is complete, I just rinse the negatives in distilled water and hang them to dry. I purposely don't wipe down the wet sink as I want that standing water to evaporate and keep the humidity up for a slower drying process. And to keep dust down. The instant the final film is hung, I leave the room to keep from stirring up any additional dust. Then I don't come back until the next day. I get perfectly flat dry negatives with no spots every time.