Ventilation can be a compounding factor not a cause in its self. The low air flow and high humidity and temps grows excessive amounts of bacteria. Much like a petri dish, increasing air flow slows bacterial growth but does not stop it. I would also suggest that vinegar is not an effective disinfectant. I too would suggest F10sc or chlorhexidine solutions. Remember almost all disinfectants need to be used on CLEAN surfaces (washed with soap first) and need contact time to work a safe bet is 20-30min. The upper surface of a rack it the real killer it needs to be wet so spray it every 5 min during the contact time. Yes it is a royal pain. I would do a full clean every few week while you have sick snakes.