if you think it's clogged with pva - then you need to soak it in warm water NOT acetone.

pva isn't soluble in acetone, just water - that's why it makes good support material.

And if - at any point - you are not sure of the temperature to use to extrude something, just search for it online, ie: 'pva filament printing temps'.
NEVER close your eye and pick a random temperature.
Most filaments come with printing instructions, for those who don't - that's what the internet is for :-)