Over time, dirt, dust, grease and grime naturally accumulate on the surface of your walls and more. But when it comes to cleaning your walls it’s not too complicated. All you need to do is give it a clean with a mild detergent, and give it a wash down with a clean cloth or car washing sponge.
Make sure to wipe the walls down with some cool, clean water afterwards if your chosen detergent doesn't have a residue-evaporating property to it.