Yes spores are everywhere. Check your optics
At this stage there are two long small openings where the roll off roof meet the top of the observatory. These are yet to be filled in, so aircon is not an option and I really don't want to go that far. Doing a bit more research and it appears that the mould is only surface mould and it doesn't penetrate much beyond the surface/air boundary. A simple surface treatment should do the job. So that's where I'll start for the time being and take if from there.
