try some acid mate but be caerful hands and eyes and also the metal object ,had same problem but had a mate with a cement mixer and he had some strong cleaner it took about 1 minit and was disoveld hop that helps atb
as above hw 35 fires fine but needs cleaning up abit scopes light and lazer were £100 notes wanting £150 pick up only bought a new gun so it can go https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-prn1/541746_191418594368861_535256819_n.jpg