So I got my Wave 4 Blind Bags in...and poor Twilight Velvet...she had a white clump of glitter on one bottom part of her hoof...so I thought:
"Hmm...maybe if I try smoothing it out...maybe a nail filer will help?"
So here's what I did:
I took a rough nail filer (with metal on the side) and rubbed the hoof a bit to spread it out. Then, I took a soft nail filer (no rough edges...just plain soft on the side) and rubbed around the hoof a bit to smooth it out.
Repeat 2 times at most...and voila!
I'll post a picture asap.