There is a product called Greased Lightening. No fumes and works really well. Start from the highest point in the room and really scrub walls and surfaces. Hot water first then rinse with cold water. Plan on repainting. You can use a clean, unused paint roller to wash the ceiling safely. Get a good scrub brush for around the tup, toilet, and sink. If the weather permits, leave the window open and leave a fan on in there to air it out.