Milky streaks are usually from inadequate fixing due to the film sticking together in the tank. I'd guess you didn't load the film on the reel properly.

Sacrifice a roll of film and practice in the light until you can do it with your eyes closed before processing your next roll of film. If you don't process film with some frequency (at least weekly), it is possible to get out of practice, so if that's the case, you might want to practice loading film onto reels occasionally between film processing sessions or take more pictures!