There seems to be some confusion around the whole question of detergent dosing which relates to the amount of water being used in modern washing machines. There is some suggestion that over-dosing of detergent can cause skin irritation.
As we all know, modern washing machines are designed to be both more efficient and to be kinder to the environment. However, by using less than the recommended dosage of detergent can mean that your laundry is not cleaned thoroughly and, conversely, using too much detergent can mean the washing machine is unable to rinse all product out of your clothes, leaving detergent residue. Read more about this here