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

Safety first: Unplug the microwave before cleaning or painting. Do not ingest any loose paint flakes.

Step-by-step checks:

• 1. Clean thoroughly: Remove all loose paint and rust flakes with a non-metallic scraper and fine sandpaper.
• 2. Treat rust: Lightly sand rusty areas to bare metal and wipe clean.
• 3. Apply microwave-safe paint: Use only high-temperature, microwave-safe cavity touch-up paint to cover bare metal.

Extensive rust, especially near the waveguide, can compromise safety and may require cavity replacement or a new microwave.