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.
Finding ore on Minecraft PE survival is hard! You may dig a massive mine and never find any diamonds or gold, you may only find a couple of pieces of iron and maybe some coal. This does not need to happen, I know a really cool way to find the ore you need fast. It involves you using two words on Minecraft PE using the same seed. One on creative mode, One on survival mode.