Before you start cleaning, make sure that you know what kind paint was used in painting the interiors of the house. While enamel can stand to washing, flat and eggshell are not as durable and may easily get removed once scrubbed hard. Nonetheless, no matter what kind of painting is used, make sure to dust off the walls before washing them. Place rag on the floor that would catch excess water once you start cleaning. Use mild liquid cleaner and water to wash smudges on the walls. If this don’t work, try the mixture of dishwashing soap and warm water.
Once done, make sure to wipe the wall with sponge and dry it thoroughly with towel to avoid streaking and water damage on the wall painting.