How do you wash cotton fiber?

Use the washing machine on a 30- or 40-degree wash cycle. Anything hotter than that and the material starts to almost rot away over time. Wash white items separately from color ones. Add a fabric softener; it's a must. Do not place the clothes to be dried on a radiator... it makes them go hard. If you have no tumble dryer, use the good old washing lines outside, or hang the clothes on a portable dryer. It's best to iron cotton fabrics -- in particular shirts -- when they are almost dry... it makes life much easier.