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The "clear tube" is called the bowden. Did you remove the bowden from either end yet? I need to see the photo but I'm guessing you can't do much until you do that. I guess you'll have to remove it from the print head - remove the blue clip, push down hard on the outer ring and pull up on the bowden. You should have the print head at 180C when you do this so that you aren't fighting with the plug also. Then once that is off you can use hot water as Robert says.
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IRobertI 516
I would try heating the tube to soften the PLA. Try dipping the clogged end into boiling water and see if that helps. Using some sort of pushing rod would likely help in getting it moving. If that doesn't work, maybe try heating the hole thing up gently in an oven (or a big bucket of water so you don't have to bend the tube too much). PLA starts getting soft around 60C or so.
Only as a last resort would I cut the bowden. Taking a couple of cm off it wont hurt but if it can be avoided that's a better option.
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