Do you have the MD foor file? You need it. Cheese grate first (sounds like a lot going on) then use MD file. Note - designed to be used dry. Then use hygiene cream, or the cracked heel cream if vegan, every night. Wash feet before applying.
Maybe do a foot cleanse at 6pm , apply cream. Have supper etc then reapply cream b4 bed for double wham. You may need to re file in between - maybe after day 5 or 6. If you ar eprone to hard skin - maybe you wear sandals/hav efallen arches (me!) then th eskin is going to re build & you will need to file on a regular basis.
I reckon once you ar eback to ground zero you'll only need file 1x per week, & use cream at least 3. Cream is good for nails, especially if they are like pork scratchings (mr B)
I've only used the hygiene btw. I lik ebecaus e this is meant to treat fungal/smellies/blistering. Emu oil is also effective. Haven't used cracked heel.