The opposite word for "be soiling" is "be cleaning". Soiling is the act of making something dirty or stained by contact with a dirty substance. Whereas cleaning is the act of removing dirt, stains, or unwanted matter from an object, place, or person. While soiling can happen unintentionally, cleaning requires a conscious effort. In most cases, cleaning is done to maintain cleanliness and hygiene standards. However, excessive cleaning can also be harmful as it can strip natural oils from the skin and surfaces, making them dry and prone to damage. Therefore, it's always best to strike a balance between cleaning and soiling to maintain cleanliness without damaging surfaces.