Multi-choice problem: Continue writing the next sentence in this paragraph:

How to clean the bottom of an iron
Mix a 1:1 solution of vinegar and salt in a saucepan.
Place the pan on the stove and heat the mixture until the salt dissolves. You can stir occasionally to help this process along.

Available options: [+] Vinegar is actually alcohol-based and has properties that help distinguish it from white vinegar, but it is also surface safe, although it can take longer to prepare and it must be sterilized. Place the solution in the pan and cook it until it dissolves. [+] If the pan requires heat you can add activated charcoal or 30 drops of liquid dishwashing liquid. You should see a film on the bottom pan when you are done. [+] Make sure you remove the saucepan before the vinegar starts to boil. Dip a clean rag in the heated vinegar-salt solution. [+] The hot vinegar will help break down the stains and dirt. Rinse and wipe away the solution.
Make sure you remove the saucepan before the vinegar starts to boil. Dip a clean rag in the heated vinegar-salt solution.