Home remedy for calluses, or ask Grandma!
How good are the methods?
Ask grandma, or the net as it is common these days. Mr. Fuss did, and it turns out there are good approaches. You could say that many home remedies for corneas are on the right track, because most of them are about softening the hardened cornea with the help of various active ingredients.
That's a good start!
Good basic principle, improvable efficiency!
Whether urine bath, Australian tea tree oil, soaking in curd soap water, apple vinegar, camomile tea bags, mostly acidic or alkaline substances are involved which soften the cornea to a greater or lesser extent. Afterwards, depending on the household remedy for calluses, the cornea is rubbed off, is easier to remove from the foot (how?) or falls off by itself (?). Others recommend to buy new shoes immediately. But on the whole, these home remedies soften the calluses first, so that they can then be removed more easily.
Softening the cornea with a liquid so that it can be removed more easily is pretty much the same principle as Mr. Fuss' Anti-Corneal, Anti-Association System.
Compared to the procedure with Mr. Fuss, however, the home remedies for corneas are less effective. The keratolytic effect of Mr. Fuss' softeners far surpasses that of chamomile tea and tea tree oil. And you don't have to buy new shoes either.
And then it all depends on how exactly the cornea, after it has been softened with one of the household remedies for corneas, for example, is finally removed. If it is to be rubbed, sanded or even planed again, then the good idea is not quite finished. Because to avoid rough skin, cracked heels or injuries, a technique is needed that does without this usually very intensive mechanical removal!
And that's why Mr. Fuss believes that the good idea can be perfected out of handed-down tradition or refined misappropriation.