- How to wash with Soap nuts: To use, put 8 – 10 soap nuts (or 3 coffee spoons of shredded nuts) in a muslin bag and place in washer. Wash as usual with cold, warm or hot water. After washing, remove bag and let dry. Dry clothes as usual. The nuts may be re-used for about 3 – 4 times until the shells start to become soft and grey, and then they should be composted.