I’ve noticed my car is slowly developing a rusty stain on the drive, it’s roughly below where the gear lever or centre of the console is in relation to the car so basically middle of bulkhead area.  Can’t find anything to suggest source other than can the ac drain or body drains cause this?

Are you sure it isn’t coolant as this can have a orange/pink/rusty colour to it?

 

 

I'd try and rule coolant out first, just monitor levels. Heater Matrix is in that area and can leak coolant, and I agree with ApertureS, it can get 'rusty'.

Thanks will check levels.