Ceiling timber in most cases is made up of waterproof timber material. It will resist water damage. You can make use of sponge and rag material to clean the roof. Do not wash with excess water. Using a pressure wash technique from the inner side of the roof will always damage the roof.
You can best hire a “roof timber repairs” team to perform this task. You can search for a professional roof repairing team to get this job done best.
Work out small areas
It is always more effective to work out smaller areas on the roof. You can divide the entire roof into smaller sections. This will offer you the best results. You may never miss out on cleaning any part of the roof.
If you notice damage signs, then do not over treat the roof this will make the reclaiming task more difficult.
Allow the roof to dry
It is better to allow the roof to dry out naturally. You can remove the curtains and leave the window and doors open so the roof material dries out naturally. The timber roof will always take some time to dry naturally.
Do not try to use a blow dry machine. It can easily damage the timber material. You can also use a protective coating to ensure the ceiling is well protected.