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Dual Extruder Blend? Answered

I have had a single extruder and after several years sucess with it I purchased a dual extruder. The problem I have is that when i want multiple color prints, where I use both extruders, one extruder or both will bleed their colors into one another. I use a wall to scrap off the extruder but they still blend into the print. Could you give me suggestions on how to prevent the prints from having smeared color in them? I am using PLA on a Flashforge Dreamer. Please.