I as well tried Castile liquid soap after seeing this post Put peppermint scented on my feet and wore either plastic bags or socks to bed and in 15 days they were 90% better. It's coming back again but that lasted 6 months should've kept up with maintenance treatments but am starting the regimen again!
I have been using Castile soap on my cracked heels for about 10 days and I'm amazed. I think I have purchased every cream on the market for my dry feet but the soap seems to work so much better. I don't use any creams and think this will solve my problems but will need more time. My feet are at least 90% better!