How do you use a deglosser to prepare surfaces for painting?

To use a deglosser to prepare surfaces for painting, first clean the surface thoroughly. Then, apply the deglosser with a clean cloth or sponge, following the manufacturer's instructions. Allow the deglosser to sit for the recommended time before wiping it off with a clean, damp cloth. This will remove any gloss or sheen from the surface, creating a better surface for paint to adhere to.