When I received the 3 neglected pygmy back in September, their hooves had not been trimmed since birth and they were 3 1/2 and 4 years old. The vet trimmed them back as much as possible, and then I had to soak them in iodine for a few everyday for a week.
They did not have hoof rott yet, but they were starting it. It stunk so bad and yes there was a bit of white "garbage" that we dug out.