Milk buildup on tongue? Can't get it off!

beachgirl24

DS has had a thick white film on his tongue since early on.  I've checked with the pedi several times and it's not thrush,it's just buildup of the milk from BF.  She said I could use a wet washcloth and try to rub it off, but that only gets a little off the tip of his tongue and I don't want to gag him!  It's not really hurting anything other than the fact that sometimes he has a sour milk breath going, and it's sort of unsightly.  But otherwise I could leave it alone, just curious if anyone else have this on their LO and have you tried to get it off?