TC #13 is not one of the most effective solvents on the market. It works okay for a first swabbing to remove some ofthe easiest, first layer ofresidue, but other than that it's seems weak to me.
Someone reputablecomplained that it causedflash rusting with black powder,but Ireally haven'tused it onany sub powders besides Pyrodex. I've never actuallynoticedany flash rusting myself, but the person who did hasmany yearsof experience and I believe him. He was mostlikely shooting with black powder and cleaning his gun with itafterwardinhis air conditioned residence.
I've also been led to believe that it's similar to a water soluble cutting oil/solution, and it's advertised as being all natural (but not really like an oil at all).
I useseveral differentsolvents. Rusty Duck Black Off BPSolvent($5/pint jug - available at someWalmarts) evaporates relatively quickly and Hoppe's #9 Plus BP Solvent & Patch Lube claims to not interfere with ignition, and it works.
That TC #13 also seemsto leave a whitish residue on metal surfaces. I've used it as a first swabfor Pyrodex during cleaning, but I always use something else afterward to clean it off the metal, and I wouldn't shoot after using it without first cleaning the #13residue out of the barrel with something else.
I don't care for itvery much and while this may sound harsh, it's my honest &humble opinion.