I tried the “boiling water bath between waxes” today and it was a total waste of time.
I removed the dirty chain, put it in an old saucepan, covered it with water and boiled it for several minutes on the hob.
I’d estimate that, generously, this removed about 5% of the grime on the chain.
Admittedly my chain was *very* gungy (winter road use), but it was so ineffective I’m in disbelief anyone has found this effective with Putoline…?