There are many synonyms for the phrase "didst washing." Some of the most common include "washed," "cleaned," "rinsed," "scrubbed," "sudsed," and "soaped." Additionally, variations on these synonyms can be used depending on the specific context and type of washing being done, such as "hand-washed," "machine-washed," or "brushed." While these synonyms all refer to the act of cleaning something through the use of water and/or soap, they may carry slightly different connotations or levels of emphasis. Choosing the right synonym for "didst washing" can help convey the specific nuances of the cleaning process and add richness to a piece of writing or conversation.