Hi Donnamay,
I know exactly where you're coming from. My future sis-in-law has the most vulgar mouth I have ever heard. I don't know where she got it from because nobody else in the family (including my fiance) swears. Every other word out of her mouth in "f*ck" or "c*unt". The fact that she's a mother of two somehow makes it even nastier (she uses this language in front of the kids).
Here's a suggestion that may seem a bit silly but has actually worked for some people. Have heard of a swear jar? Get a big ole jar and make your hubby put in a dollar everytime he swears. I actually got this idea reading "Dear Abby" several years ago. Its suppose to work. *fingers crossed*
The other thing I can think of to do is just completely ignore him. Like, if he's talking to you or asking you something and filling the statement with swear words just ignore him. Then when he asks why you're ignoring him just say, "I'll respond to you when you speak a little nicer to me." Maybe that will inspire him to clean up his language a bit.
Well I hoped this helped a little. Take care and good luck!
Nic