Can you pour vinegar down an AC drain pipe?

Yes, pouring distilled white vinegar down your air conditioner condensate drain pipe is one of the best, safest, and most widely recommended methods for routine maintenance and clog prevention. Vinegar contains acetic acid, which acts as a natural cleaning agent that neutralizes and kills algae, mold, mildew, and bacterial slime without introducing harsh chemical compounds into your plumbing system or damaging the PVC piping. To perform this preventative maintenance, simply pour about one cup of straight distilled white vinegar or an equal mix of warm water and vinegar down the T-shaped vent opening of your indoor drain line once a month during the peak cooling season. Let it sit undisturbed for twenty to thirty minutes to break down organic buildup, and then flush the line with clean warm water. This monthly routine keeps your system sanitary, prevents messy indoor water leaks, and ensures your air conditioner drains properly all summer long.