[header] How to clean the bottom of an iron [title] Mix a 1:1 solution of vinegar and salt in a saucepan. [step] Place the pan on the stove and heat the mixture until the salt dissolves. You can stir occasionally to help this process along. 
Make sure you remove the saucepan before the vinegar starts to boil. [title] Dip a clean rag in the heated vinegar-salt solution.