Dryer leaves black or brown marks on clothes after drying.

Safety first: Unplug the dryer before internal inspection.

• Inspect drum surface: Look for rough spots, melted plastic, or rust inside the drum. Clean with a non-abrasive cleaner; sand and repaint rust with high-temp appliance paint if necessary.
• Check felt seals: Remove front panel and inspect the felt seals for wear, tearing, or contamination with grease. Replace if damaged.
• Inspect rollers: If rollers are shedding grease or rubber, replace them and clean any residue from the drum path.
• Run a test cycle with old towels to confirm no further staining.