Morning, I use Pro Linc Be Callus. I get it on ebay. It is a great treatment and very cost effective. You don't need to do a course, so long as you are qualified in pedicures. On my price list I have worded it TREATMENT INTENSIFIERS
(Add to any feet service) £8.00
Breaks down calluses in 5-10 mins
Hard skin eliminator
Or treatment without Pedicure. £15
It is self explanatory - just follow instructions.
What I do to make it look more professional - I lay them face down on my beauty bed (if you have one) or just do it in chair. Then I place a thin piece of lint-free wipe on where the calluses are and put liquid on until it is soaked and then cover with cling film and leave for 10 mins and then scrape off with either a plastic scraper or side of a file, which I keep for each individual client, and then proceed with normal pedicure - I don't soak first. If they are really bad I use my MicroPedi machine first. Hope this is of some help. It is a lovely effective treatment and they can come back inbetween pedicures, if they wish, for a treatment.