It needs

The main work will have to be performed with a spatula, so it needs to be sharpened by a bar. Scraping old coatings on the ceiling — whether whitewashing, paint, plaster — the process is heavy and tiring. But you can’t get around it. With particular thoroughness, you need to scrape the corners between the ceiling and the walls. We must not forget about the periodic undermining of the spatula and keep the beam nearby.