How long should a disinfectant sit on a surface before air drying?

• A. 30 seconds
• B. 1 minute
• C. 2 minutes
• D. 5 minutes

Answer: (C)

Disinfectant contact time is the key idea here. The surface must stay visibly wet with the product for a specific duration so that microbes are actually inactivated. If you wipe or air-dry before that time ends, the disinfectant hasn’t had enough time to do its job, and disinfection may not be reliable. For this item, two minutes is the required period: keep the surface wet for two full minutes, then allow it to air dry or wipe it away per the label. Shorter times like 30 seconds or 1 minute typically don’t meet the product’s kill-time requirement, while a much longer time isn’t necessary for this product and isn’t required unless the label says so. Always follow the label for the exact contact time.