Ethanol is sometimes denatured with isopropyl alcohol...IPA of that type isn't free of a toxic hazard. Of course methanol is even more frequently used and it's a little nastier. But again, not a huge toxic risk either way.
Some other IPAs are quite drinkable, if you like hops...and they contain alcohol which isn't denatured. But if you were to use them for cleaning, you'd definitely insult the brewmaster.