The Dead Washing Themselves
Scholars have said that seeing a dead person washing themselves in a dream might indicate the removal of worries from their descendants and an increase in their wealth. If someone sees themselves washing a dead person, it could signify that a man with corrupted faith will repent at the hands of the washer. The washed person might be a beneficial merchant who saves people from their troubles, or an honorable man through whom corrupt individuals repent.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.