What kind of lube is it? Most lubes will remain stable for years and not cause a problem. I leave lube in my Lyman and simply use it the next time. I don't know how you would get the old lube out anyway. Perhaps a heat gun and warm things up a bit.
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Unless you are changing to a different lube I see no reason for cleaning it out. Bullet lube doesn't die from old age and the machines aren't made to allow removing it readily.
The only time I ever "cleaned" my Lyman 450 was to switch from the original Lyman black lube to the NRA formula Alox. I simply removed all the parts and put it into a bucket of water. Heated the water over a Coleman stove until it was boiling and the lube melted out, floated to the top. Inside it was a clean as if new. That was in '71 and it's never been cleaned (internally) or had the lube replaced since.
take the luber and turn it upsid down heat with a hair dryer,it will all flow out.
I have lube in mine and have stored a case of sticks and blocks for 20 yrs. and its still good.its just grease and wax.