"A bit of Murphy's Oil Soap in water plus a toothbrush?"

Yes sir that will work well but a word of caution. Everything that currently might appear to be finish probably is not and will be gone. Not a bad thing but don't be shocked by how little might be left. I've done two sets of targets, with the same result. The process will not raise the grain which is good. When finished, the bath solution will look similar to drained motor oil out of a '65 Chevy. Regards, hardcase60

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You want me to do what?