Microwave interior paint is peeling or rust is visible inside the cavity.

Safety first: Unplug the microwave before cleaning or repairing the cavity.

• Clean and dry: Remove all loose paint chips and rust flakes. Clean the area with mild detergent and water, then dry thoroughly.
• Assess severity: Small rust spots can sometimes be treated with microwave-safe cavity touch-up paint. Follow the paint manufacturer's instructions and allow full curing before use.
• Avoid exposed metal: Do not operate the microwave with large areas of bare metal exposed, as this can cause arcing.
• Next step: Extensive rust or peeling may compromise safety. In such cases, replacement of the microwave is usually recommended rather than repair.