Throwing the machine away is the best recommendation. You have a bad drum/developer that is leaking some toner. Could be a bad cleaner blade for streaks on the front; fallen toner for streaks on the back. Careful cleaning, replace transfer roller. First, check the condition of the fuser assembly. If the soft roller is bad it will leave toner buildup on the teflon roller, and vice-versa. Start there.
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Throwing the machine away is the best recommendation. You have a bad drum/developer that is leaking some toner. Could be a bad cleaner blade for streaks on the front; fallen toner for streaks on the back. Careful cleaning, replace transfer roller. First, check the condition of the fuser assembly. If the soft roller is bad it will leave toner buildup on the teflon roller, and vice-versa. Start there.