To dream of something being filthy represents feeling about yourself or a situation being excessively disgusting, unclean, ashamed, perverted, or undesirable. Feeling that you have a lot of things wrong with you. Thoughts or anxiety about experiencing poverty.
Example: A man dreamed of wearing filthy clothes. In waking life he had just had a child and was having insecure thoughts his child growing up in the same poverty that he had.
Example 2: A woman dreamed of swimming in excessively filthy water. In waking life she was in the first year of a coarse for therapists and self-diagnosing herself too much while learning about all the possible psychological problems people can have.