Oil paintings are strong. The pigmentation hardens over time and often will be varnished making it extra resilient, however occasionally they will get dusty and need special care to help them look their best.
Keep oil paintings clean by wiping them gently with a damp cloth. Because the oil is impervious to water, you won’t damage your artwork. It's best to hang oil paintings away from moisture or direct sunlight as it may cause harm to the condition of the artwork.