When it comes to cleaning, the term "cruds up" might be unfamiliar to some people. However, it refers to the build-up of dirt, grime, and other unwanted substances that accumulate over time. To better describe this process, we can use synonyms such as "mucks up," "gunks up," "spoils," "stains," "pollutes," and "tarnishes." All these words can convey the idea of something that is becoming increasingly dirty or unclean. When dealing with grime and filth, it's important to know different terms so that we can better communicate with others and select the appropriate cleaning products.