I always thought you had to use boiling hot water and that Amonia was not necessary
At any rate I've used boiling hot water on a couple of mausers with good results. I saw on Youtube where Sturmgewher used a spray bottle of water on a semi auto ak and he said that was sufficient as long as you get the water where the corrosive particles have touched. I really like this guys videos, very informative!
Here is the link: