Well, what exactly is a detergent? A detergent is basically some type of oil that contains hydrophobic non polar sections and hydrophilic polar sections. And when we add our detergent to the water. The polar section of our detergent will try to interact with the water and that will break the intermolecular bonds between water molecules. And the non polar will try to orient itself as far away from the water and that will also break intermolecular bonds. So by adding our detergent that contains hydrophobic and hydrophilic regions, we essentially break many of those inter molecular bonds that are needed to create the spherical shape.