Do not fret. Here's a simple way to clean that disgusting iron.
- Place an unused dryer sheet into the fold of a square of fabric.
- Put the fabric square on the edge of the ironing board.
- Scrap the hot iron across the fabric removing the dirt.
- Repeat until the iron is clean and you have stopped fretting.
A second word of caution. If your iron has baked on crude you may never get it clean. I suggest throwing it away or at least giving it a decent burial.