hi there .. very easy way .. you need a flat mopping system from vileda pre spray the walls with multi pupose cleaner in a spray bottle .. in your mop bucket put mpc and quite warm water and literally go up and down the walls with the flat mop its so easy and you get great results and your back and arms do not ache .. if you get stuburn marks on the wall . again prespray and use a scouring pad like the ones you use in your kitchen (they are not to abrasive) buy them from the 99p shop if you have one . they are better quality,larger and longer lasting than the ones you get from your supermarket .. finish off by rinsing with your flat mop..regards......rafferty