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We were warned not to use water but that we should use regular smokeless powder solvents by Western when they published the first info on Blackhorn 209.
Yes it is rubbing alcohol but watch the percentage it is best to keep it above 90 because the rest is water and may leave moisture if the percentage is to low.
Breach plug, I use the same mixture on the breach plug I just put some on a rage and wipe it off but you do need to clean the carbon out from between the 209 seat and the touch hole, a drill is the best way, I just have a 10 dollar flash light battery drive screwdriver from Walmart that comes with a 1/8 inch drill and tt only takes a second that way. Lee