How to remove glued parts ?

What kind of glue? CA can sometimes be removed using fingernail polish that contains acetone. There are also specialty-made debonders for CA. For the kinds of glue that actually "Weld" the plastic together you are pretty much going to have to cut or break the joint because the plastic has been melted together there.

If a part has been glued together using tube cements (and some liquid cements), placing the model in the freezer until "frozen" will sometimes cause the bonds to simply "pop" apart. Wedging a knife or other "spreader" into a frozen bond can also speed parts separation.

Gip Winecoff

sorry.. what is CA ?
I am using revell glue.
Well, I can try the finger nail polish and freeze them.

CA stands for cyanoacrylate (C5H5NO2, for those who are chemistry buffs). You probably heard it called "super glue."

Since you did not use CA I don't thing you need to use acetone.

how bout for tamiya cement? will the freezer trick work?

Possibly, since tamiya cement is a liquid.

The freezer trick works for just a bout any liquid cement (I think). Just give it a try, you'll find out then.

For tube glue repeated applications of alcholol will weaken the glue and make it brittle. for liquide cement the freezer trick is the way but you may want to score around or down the part to be removed to get a cleaner seperation