Washing out is a term that is commonly used to describe the process of removing dirt or stains from a surface. However, there are several antonyms for this term, which can be used to describe the opposite action. One of the antonyms for washing out is "staining," which refers to the process of adding color or discoloration to a surface. Another antonym for washing out is "soiling," which means to make something dirty or unclean. Other antonyms include "smudging," "smearing," and "defiling." By using antonyms for washing out, we can better describe the different actions that can be taken to alter the appearance or cleanliness of a surface.