Extension Special Series No. 11-N
Cleaning up a little dust and dirt is much easier than cleaning up a lot of dirt and grime. The heavier the dirt becomes, the harder we must clean. The rougher we clean a surface, the faster it will wear out. Thus, by keeping things clean, we can make them last longer.
South Dakota State University
Service, Cooperative Extension, "A Clean Home" (1973). SDSU Extension Special Series. 92.