Cleaning and tidying are necessary activities that help us maintain a healthy environment. Therefore, the antonyms for "made filthy" are "cleaned," "sanitized," "sterilized," "hygienic," "spotless," "immaculate," and "pristine." Cleaning removes any dirt, dust, or bacteria that can accumulate over time, and it also helps to preserve the life of objects. Sanitizing removes bacteria, viruses, and other microorganisms from surfaces to prevent the spread of germs. Sterilizing is the process of killing all microorganisms, making a surface or object completely germ-free. A hygienic environment promotes health and decreases the likelihood of illness. Spotless, immaculate, and pristine denote extremely clean or unspoiled surfaces, indicating there is no trace of filth or dirt.