Why are small droplets of oil easier to rinse through fabric than larger droplets?

Small droplets of oil are easier to rinse through fabric than larger ones because they can more effectively pass through the narrow spaces, or interstices, within the material's fiber structure.

When a detergent solution breaks up an oil film, it is essential that the resulting oil droplets remain in a stable, highly dispersed state. If these droplets are not kept in this fine, deflocculated condition, they tend to flocculate—coalescing into larger aggregates that become trapped by the fabric or redeposited onto the surface. By maintaining the oil in a highly dispersed, small-droplet state, the detergent ensures that the soil can be carried away by rinse waters without being retained by the fabric.1