Odometer issue...

Hi Folks, I have a curious question that I wasn't quite sure where to ask at, but thought that this might be the right place. The odometer has quit working on my 93 Mark VIII and the traction control button stays off. I was told that the wheel speed sensor could be the problem and might just need to be cleaned. This is something I have never dealt with before so I thought I might ask before I started in on anything.

Has anyone else had this happen?

Are the wheel speed sensors easy to access?

Thank you in advance for any help with this issue. I appreciate it.