Try the atomic method of cleaning the tip first as that is easier:
There is an easier version where you don't remove the bowden and just pull from the back of the machine. Same temperatures. But let the filament tip cool in the bowden for 10 seconds before pulling through the feeder or it might come apart. I actually do this on every filament change now (don't use the menu filament change). It's easier to pull the filament through the feeder than I would have expected - when the servo isn't powered it offers almost zero resistance.
I used woodfill also on my U2 today and it was a disaster. I tried several times after cleaning the nozzle. The filament has to many particles and is not suitable for a 0.4mm nozzle I think.
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