Microwave cavity accumulates excessive condensation or water droplets during and after cooking.

Safety first: Unplug before cleaning vents.

• Use covers: Cover high-moisture foods with a microwave-safe lid or wrap to reduce steam release.
• Ventilate cavity: After cooking, leave the door open for several minutes to allow moisture to escape.
• Clean vents: Remove dust and grease from external vents with a vacuum and soft brush.
• Check fan operation: During cooking, listen for the fan and feel for airflow at the exhaust. If weak, the fan may need service.

Warning: Persistent moisture can lead to corrosion and electrical faults; address ventilation issues promptly.