[andy_d]

that one?
if so

The Forte product is one of the easiest to use, as you only need to discharge it into cabin and the recirculation system ensures that it’s taken into and distributed throughout the ducting system.

“The treatment contains a powerful antimicrobial agent, which cleanses the air conditioning unit of any mould and fungi that have become trapped deep inside the system during periods of non-use, and eradicates the type of bacteria that have been known to cause car occupants allergic reactions and asthma-like symptoms”.

“The dual action treatment entails running a vehicle's air conditioning system on re-circulate and leaving the can of treatment fully activated in the front passenger footwall, to automatically discharge into the passenger cabin. The normal air conditioning setting is selected for a further five minutes. As a result, mould, fungi and bacteria are eliminated and bad odours are neutralised, leaving a fresh apple fragrance in the car”.

http://www.forteuk.co.uk

(lifted from http://www.fordscorpio.co.uk/acdrain.htm )

might be of some help ?