Generally, walls and ceilings are painted with either latex or alkyd paint. Latex, a water-base paint, is easy to wash after it has "cured" or set for a period of time. Alkyd, or oil-base paint, is durable and washable. Both types come in four finishes: flat (for walls and ceilings), satin (for doors and trim), semigloss (for walls), and gloss (for kitchen and bathroom walls and woodwork). You can clean painted walls with all-purpose cleaners.