The Solution...
Outdoor - Rust
Step 1
All is not lost.
Step 2
Mix a solution of household ammonia 1 tablespoon to 1 pint water (keep room well ventilated).
Step 3
Do not overwet the area.
After treating the stain, blot up any excess liquid.
Important
Always test an inconspicuous area before use.
Always wear rubber gloves.