Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Hanging laundry in a dream indicates revealing secrets. If the laundry is clean, it is the revealing of good matters. If it is dirty, it is the revealing of bad matters.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Hanging laundry indicates the return of an absent person or travel. It may also indicate the removal of worry.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Hanging laundry is interpreted as good praise. Whoever sees himself hang laundry, his reputation for good will spread.