How to encode special characters in Integration Broker messages

I am extracting Purchase Order information via Integration Broker messages.  I am sending these messgaes to various other systems.  Part of what I am sending is PO Comments and PO Line comments.  These are clob fields and have special characters in them.  Some of the special characters can be removed.  Others need to be encoded because they hold value for other systems.  For instance, I can remove ¿, but I want to encode é.  This should be encoded as é.

What is the best way to do this encoding?

I have tried to encode specific fields as I populate the message (before publishing).