In article ,
Colin M wrote:
BMW recommend you use recirc and spray the stuff into the internal air
intake

Thanks for that. My thoughts on going through the outside was that I'd
pick up an extra section of duct from the windscreen to the fresh/recirc
mixer.

The problem appears to be only in the A/C heat exchanger itself - the
bacteria grow on the very cold surface, rather than the surrounding
trunking.

--
*Eschew obfuscation *

Dave Plowman London SW 12
RIP Acorn