T.W.
One tip I got from my doctor (surprisingly enough) was actually NOT to use soap "down there"... He said that although it might be cleaner for a few seconds, soap actually kills the good bacteria and can cause more odor and itching. I found it to be true... You might want to check up on the IUD though-foreign bodies can always increase your risk for infection. Good luck!
I also sometimes use the Monistat wipes... They help you feel a little fresher throughout the day too.