Work for Hire, protecting prior knowledge and materials

Greetings,

Question: How to respond to the "everything you do here belongs to us" clause in the contract for prior experience and work?

I am about to accept a job offer and one of the items in the employee manual states that all work done whilst employed is considered "work for hire" and that the company owns it. Yes, I understand how that works and I'm fine with it.

One job item is to teach a certain software package. A major reason I am attractive to this company is my background in teaching the use of this software for several years as both a freelancer and a university professor. Over the years, I have written many lesson plans, learning materials, etc. and I've also been working on a textbook.

The company will want me to create learning materials etc. for the training I do for the company. These will be based on my past experience, etc. How do I pose the concept that my training materials should be exempt from the work for hire clause.

By the way, the company uses this software as part of their process to provide a service to their clients that have nothing to do with the software I will be teaching. For example, teaching MS Office to a pool supply company. Teaching Office is my job, but teaching Office elsewhere would not compete with the selling of pool supplies.

Thanks, Scott