i poured the very hot water into my toilet,then dish soap, i cleaned it in there,then i flushed it,then use cool water in toilet to rinse it,then i went to basement ,and grabed my clean patchs..before i pushed it in i noticed rust near muzzle..my patchs came out brown..

maybe as you said secret is to get barrel dry before it flash rusts..i dont know i was hurrying as fast as i could to dry it..