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Well, the alcohol works well enough that I'm not going to chance the acetone, since the material is acrylic/plastic.
It'll take awhile but, what I've been doing is wetting a strip of paper towel with denatured alcohol and laying it on the caulk. On top of this I place a strip of aluminum foil to keep the alcohol from evaporating and finally, on top of that a wet washcloth to keep the towel pressed against the caulk. It'll be interesting to devise some way of doing this on the vertical parts at each end.
Anyhow, an hour of this treatment seems to work well but two works better. It returns the caulk almost to its initial gooey state - soft enough to be wiped off with a kleenex.
To speed things along I took off some of the heaviest parts with a rotary file chucked into an electric drill. Tried the Dremel tool too and that seemed to work better - more control. This requires serious focus though to keep the tool from jumping and hitting or damaging the tub finish.
Thanks again for the assist.
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