Like Alan said, download the .pdf manual for your LAM. I find it easier to use heat (either an electric heat gun or a propane torch to get the old lube out when I am cleaning a lubrisizer.

Take the sizing die out, heat gently, and push out all the old lube you can. Then remove the lube piston and turn the press as needed to get all of it out.

The only other thing to be careful about is installing the sizing die retaining nut; the threads are pretty fine, make absolutely sure you don't crossthread the nut.

Robert