Mostly they don't consecrate side Altar tools, but I've seen some say it is better when we do, I think doing that only gives them better feeling about the whole thing. Since what we do is greatly depends on our feelings, I think when you feel to get a better result this way, then why not. in conclusion I say that consecrating every thing wont ruin what you do, therefore although it is not necessary, it's up to you to do that.
Keeping everything clean is like you said common sense. Personally I consecrate everything that I'm going to use for magical purposes. Also I don't let anyone touch any of my items even if they are "mundane" things, because I don't want someone else's energy on the item. Hope this helps you, but remember everyone does things differently so take it all with a grain of salt.
Weird, I'd written a response to this, but it seems to have disappeared. I'm not sure why. Anyway,what I said is that if a tool or item is going to be used exclusively in ritual or magical work, in my coven, we do tend to consecrate it. The incense burner that I only use on my altar during ritual has been consecrated, for example, but the one I keep near the cats' litter box for when they are really stinky does *not*, even if I do sometimes that same burner to hold incense for a ritual bath. The mortar and pestle I use for incense in circle is also used for incense that I make just to make the house smell nice. It doesn't have an exclusively ritual or magical purpose. We also consecrate divination tools such as tarot cards, runes, or pendulums.