Hey Wayneh24

I had the same problem so i called an AC company. This is wat i got from him:

He asks: You only use the AC when its hot:
I replied: Yes.

He asks: You don't drive much
I replied: yes. (and previous owner didn't drive at all)

He says: Turn on your AC all the time for the next few weeks/days, evenually the smell disappears.

That worked for me, after about a month the smell disappeared.
My advice would be turn your AC on for a few weeks, after that try to use it once in a while. (i also turn it on and put temperature on red/high)

Good luck with it!