Stopped by yesterday at the job site and the smell was gone. The boys cut away most of nasty spray foam and sprayed the walls with some kind of cleaning agent. Not sure what it was but I did not notice the smell anymore.
The smell came back - the spray just masked the odor for a day! My clients called the Spray Foam Council and told them the smell should be completely gone AFTER the walls have dried from what ever application was added...... Try Try again boys.