How to loosen blue lock tite

Wanna change out my drive shafts and having horrible time gettin set screw from diff gear loose cause of loc tite any suggestions

Heat.  Heat will loosen the Loctite, but be careful of any plastic parts.

Heat or just a good quality Allen that you can get some force on and not strip.

You might get by heating only the hex/allen wrench and inserting it into the screw and letting the heat transfer for a moment or two before attempting unscrewing it.

'Heat' is or RED Loctite!
Just remove a bolt doped in blue
... but yes, if stubborn it might because the bolt is over tightened and in that case defiantly heat may help! Blue would never make the bolt so tight it can't be removed ... if this is the case look for other reasons.