Then rinse your self healing mat with cool water getting all residue off the mat. You can dry it with a cotton towel, or air dry. It does not matter how you choose to dry it. The reason for this method is the materials that make your self healing mat absorb the water and make the mat supple again. Not only does this make your mat last longer, but it keeps your blades from dulling so quickly because you are cutting into a softer surface.
Iron ingots can be primarily obtained by Smelting (with the help of a Furnace) of iron ore found while mining. However, they can also be found in Temple, dungeon, and stronghold Chests. Rarely, Zombies will drop items made of iron, due to them wearing iron armor or holding an iron tool, or just the ingot itself.
Loot can be found in Minecarts with Chests that spawn in Abandoned Mineshafts. The Loot consists of items from 3 different groups each with their own distribution: In addition to the loot found in Chests, the Mineshafts exposes the Ores of the surrounding Biome, making it a good place to mine.