Under our kitchen sink, we have more kinds of cleaning products than we have different kinds surfaces to clean. In an algebraic sense, if I make a one-to-one mapping of cleaning products to the surfaces they are intended to clean, we still have excess products.
What on Earth for?
Perhaps some of these are for combinations of stains and surfaces. One might be for poultry grease stains on Italian wool, another might be designed for Oklahoma clay stains on Brazilian granite, and so on.