I highly recomend Nitro Mors for metal modles. This stuff eats anything with a high oil ratio. It can deal with green stuff, glues, paints, hair, skin...just make sure that you remove any plastic components before dunking them as they'll become puddles. Also be careful where you dispose of it, if there isn't a lot of running water it will have a field day with plastic drainage pipes. i used a plastic nail brush to scrub the models afterwards and forgot to take it out of the diluted milimeter thick puddle that the models now sat in, i came back that evening and it looked like i'd left it cooking on a grill.