I think if it's on the outside ob, you will probably be okay. It's probably just a bit of spilt stuff combined with the air con environment especially if an evaporative air con.
I really think you need to clean with detergents and sanitise with an acid so I'd get an acid-based sanitiser (iodine or something like Star-San) to accompany your PBW. Hit the lid and outside with that before bottling. I believe but might be wrong that Oxy-Clean (Nappy-San) will build up a layer over time where bacteria can become trapped.
After doing the above, pull the lid off and have a quick look and then cover the top with a clean towel. If you don't see any alien life forms in there, have a taste of the wort. That will tell you if something has gone horribly wrong. (If we never hear from you again, I'll assume tasting the wort was bad advice and will never give it again

). If no horrible taste, bottle away.
Seriously, I think dong the above is fine. The only worry I have is where you say air con and I am thinking of legionnaire's disease or something that comes from air con. From memory, it's air-borne though.
My fingers are crossed for you

,
PP
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