Hey Ernest, try doing a scan to pdf. Do the streaks show up there? If so, the problem is with the scanner side. If so, there's probably some dust on the bed. When you open the bed, you'll see a thin(1cm) strip of glass on one side. Give that a nice cleaning and try again. Good luck!
Question...does this printer have a drum...if so have you replaced it? ... also check the toner cartridge... also you might want to try---> buy cleaning sheets from Staples store/online... try these 1st! You might want to call 1st before you bring it to microcenter...I think they repair them, but not sure...
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