Because it allows the product to seep into the pores of the metal. I know this may sound like a load of crap, but ask any chef and they will tell you that to truly clean a greased/seasoned pan, you need HOT water to head and open the pores so that the the "seasoning" can be washed out of the pores of the metal. Same for seasoning the pan in reverse. Or, in this case, a BCG.
I'm also wondering which Froglube is better to run on a hard use carbine? The paste or the liquid?
I'm guessing the paste might be more optimal for lubrication, and the liquid better for cleaning?
The point is not to wash the seasoning out, it's to open the pores to allow the seasoning to penetrate the pores. You never want to wash away the seasoning, in fact reapplications just further apply, or top off, the seasoning.
The idea is to treat the clean metal surfaces the first time, and then create a seasoning layer. When the gun gets fouled, get it warm, allow the FL to penetrate/lift/disolve, and then wipe off. When it's "clean enough" you are GTG, or if you are truly anal, re-heat and apply a 2nd application of FL to top off the seasoning.
Maybe I'm doing it wrong, but I use the paste for the first treatment of parts because it's easy to brush onto the surface and spread around. That's *if* you're heating the parts up for this. Other than that, I prefer to use the liquid...for either cleaning or lubing.
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