Never.. ever.. !! use ammonia on your rifle
Use rifle cleaning agents, or simply oil..
Ammonia is to agressive for the metal, you have numerous cheap cleaner that are much better..
Surplus weapon cleaning oil is good for corrosive cleaning aswell.. the only problem with that is that it doesn't remove copper/lead..
But I guess you can't really screw up much for $89, but really, it's a no go..
If you want to really clean your rifle properly, get BoreTech Elimator.. (removes copper, lead, powder remains + burned stuff) and isn't thát expensive.. (pricy, but not über expensive)
And AK70, don't you guys have Prvi Partizan? It's the not cheap, not expemsive ammo from serbia.. .308 costs €410 per 1000.. Surplus costs €259 per 1000, and lapua €650 per 1000.. but they sell 7.62x54R aswell..
The "soviets" had a lot of corrosive ammo.. but it doesn't matter, as long as you clean your rifle properly..
But soviet surplus isn't for expensive weapons anyways.. you don't shoot inaccurate ammunition in a expensive rifle..
Btw here some Dutch prices / per 1000:
.223REM = Wolf €195, Prvi €260, American Eagle €260, S&B €320 (62Gr FMJ)
.308WIN = Surplus €250/€259, Prvi €410, S&B €480, Lapua €650, Norinco copperplated steel cases €275 (146 to 150gr FMJ)