Thanks I’ll check it outFor the drops it would probably only change the top layer of soap which might work fine use top layer then reapply after it gets weaker. Changing the whole tub to glacial I don't think would work unless you mixed it together very well which I don't think would be easy with thicker soaps unless a glycerin soap which you could melt. I know you can put crystals into soap and they eventually will dissolve as well, but probably not the whole tub.
For menthol crystals I grind them into the amount of water in the bowl that I think I will need for the soap and they slightly dissolve after 30 seconds or so. Maybe I could skip this part, but it works for me. I lather then they usually completely dissolve by time done lathering. It's probably only happened once where I felt a little crystal not unpleasant just noticed it and took it out. DK damnfineshave on youtube does this quite a bit if you like to see it somewhat visually he did it with B&M arctique recently.