Besoiling means to soil, stain or dirty something. The opposite of besoiling is cleaning, purifying, or whitening something. For example, if we besoil our clothes, we can clean them by washing or dry cleaning the garments. We can also purify or detoxify our bodies after besoiling them with unhealthy foods or substances by eating clean, healthy food or drinking plenty of water. When we besoil our surroundings, we can clean or sanitize them by using soap, disinfectants, or other cleaning agents. Thus, the antonyms of besoiling are all about clearing up, cleaning, and purifying whatever we have besoiled.