The Sponge Caste System
Like a terribly unfair culture wherein people are born as second class citizens, and toil through life without any hope of aspiring to any sense of self-worth greater than whatever delusions their own ego has afforded them, my sponges (at the time of purchase) are assigned a rank and class from which they stand no chance of emergence.
Sponge etiquette is something rarely discussed, and thus I feel compelled to contribute my views on this topic before I delve into search related matters. Additionally, I will want to make future references to The Sponge Caste System in metaphor and simile, so it behooves me to introduce the characters now.
At the bottom of The Sponge Caste Sytem is the bathroom sponge. Handled only with rubber gloves, the bathroom sponge is the grimy leper of its race. It is used to wipe the most vile places. While death row prisoners are given one last meal of their choice before execution, the bathroom sponge has not a last supper, but is rather face-planted against the toilet then used to vigorously scrub it clean. Once it is saturated with toilet juice, it is eliminated.
Above the bathroom sponge in the caste system is the floor sponge. As the name suggests, it is used only for floors. Above this sponge is the counter-top sponge, and at the most esteemed and highest level is the dish sponge. Like the Department of Homeland Security, the dish sponge protects our health and well-being. Which one is more important at that role is arguable.
A dish sponge should never be used to wipe anything other than dishes. I have seen people use a sponge to wipe nastiness off the floor, then clean the dishes.
OK, now that we have that out of the way, I will move on to (mostly) search-related topics.

