Is it more efficient to was a full load or a small load of laundry in your washing machine?
SCROLL DOWN FOR THE ANSWER BUT THINK ABOUT IT FOR A MOMENT
A full load, if you have to was a small load, adjust the soap and water. Using too much detergent is actually less effective for washing.
Of course, if you use a phosphate-free detergent - all the better. And you can reduce the amount of detergent and increase its effectiveness by adding 1/2 cup of baking soda or borax.
Plus, vinegar (about 1/2 cup) in the rinse cycle is a natural fabric softener.