Your iron can get a build-up of starch and dirt on the surface that reduces its ability to iron your clothes and always makes me nervous that it will transfer to my shirts. To remove this mess, mix a thick paste of baking soda and clean water. When the iron is cool, scrub the iron with a sponge covered with the mixture. Really old, baked-on stains will take more time to remove. Once finished, wipe off the excess with a clean towel. To remove the extra paste from the holes, use Q-tips.