A company that produces laundry soap is testing a new ingredient to add to their product that they think will clean clothes better than their standard formula. They started with 200 pairs of pants that were all equally dirty. They then washed 100 pairs of the dirty pants with their standard formula and the other 100 pairs of dirty pants with their standard formula PLUS the new ingredient and measured how clean they were after being washed. What is the independent, dependent, and control variable?