Clean the insoles with vinegar. Using a mixture of 2 parts vinegar and 1 part hot water, soak the insoles for a few hours. Vinegar is a natural disinfectant and will work to kill the bacteria hiding in the shoes.
Huge amounts of iron are used to make steel, an alloy of iron and carbon. Steel typically contains between 0.3% and 1.5% carbon, depending on the desired characteristics. The addition of other elements can give steel other useful properties.
This page looks at the use of the Blast Furnace in the extraction of iron from iron ore, and the conversion of the raw iron from the furnace into various kinds of steel. The common ores of iron are both iron oxides, and these can be reduced to iron by heating them with carbon in the form of coke.