Some sort of rodent eating firewall insulation - GRRRRR

[Blade1668]

The best thing I've found to reduce this problem....

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[AustyPosty]

Spray that firewall insulation with pure peppermint oil, you can get a decent sized bottle on amazon. You can also soak cotton balls with peppermint oil and leave them in your engine bay, just be sure to replace them periodically.