Source: The Great Interpretation of Dreams (Ibn Sirin)
An ablution place in a dream indicates a place for relieving oneself, or repentance and purification. Performing ablution in it indicates the end of worry and relief.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
An ablution place indicates a man who helps with purification and repentance.
Source: Signs in the Science of Expressions (Ibn Shaheen)
An ablution place is interpreted as relief. Whoever sees himself performing ablution in it, God will relieve his worry.