Respected Sir/ Madam,
This email is to inform all the residents of ___________ (name of the dorm) about the cleaning day for the dorm.
It is to bring to your kind concern that the cleaning day has been fixed on __/__/____ (date). The cleaning drive will begin at __:__ (time) and you all are requested to contribute in the same. The motive of the drive is to maintain the hygiene of the dorm residency.
Your cooperation and involvement shall be highly appreciated.
[Digital Signature – if applicable]
____________ (Contact details)