Em,
The Soviets had an alkaline solution in one compartment as a cleaner/neutralizer & oil in the other side.
In my case, I don't mess with boiling water, either creating it & risking a burn or a mess in pouring it down the bore, and I don't have to worry about where it goes when it comes out the other end.
I do not disassemble my rifles beyond removing the bolt.
I can do the whole process sitting in front of the TV in the living room.
For me, simpler & easier.
For you, do whatever you want.
My point was that boiling water is not necessary for those looking for alternatives.
There is no one single correct way to clean a Mosin.
You may notice I didn't even get into the WD-40 thing, which I will not allow in any of my guns.
Denis