Hard surface cleaners combine surfactants, water sofeners and builders to effectively remove soil from surfaces. Other ingredients can be added for special cleaning needs. These include solvents, bleach and abrasives. Solvents are generally added to liquid cleaners to help dissolve tough soils such as greasy food soils and soap scum. Bleach can be added for extra stain removing power. Abrasives assist the cleaning agents in removing tough dirt such as soap scum and crusted-on food soils on stoves.