Posted By Louise Ward Hi Gary In a previous job I remember the air conditioning engineers having a wonderful substance called 'Mask'. It was basically a perfumed liquid (various scents available ) which they placed in a large container in front of a powerful electric fan. It was amazing stuff. We used it to cover the smell from a broken soil pipe, epoxy floor paint, ammonia leaking from a damaged refrigerator and various other 'nasties'. It did seem to have an immediate effect and may be of use to you. I got the impression that it was a well established system for deodorising and I guess that your own (or any large air con) contractor should be able to provide details. Hope this is of use. Louise