You can set your washing machine to standard settings and turn them inside out and throw your cotton garms in. The only trick with cotton is the temperature you wash it in—don’t go for high degrees because it can lead to your cotton clothes shrinking and the colors running.
Heat isn’t cotton’s best friend, so you should avoid tumble-drying. It’s better to line or flat-dry your cotton clothes. And if you’re drying them outside, don’t forget to turn the clothing inside out to prevent the colors from fading in the sun.