I like to use ether as cleaning fluid. Because it is pretty much non toxic, it does not attack plastic like acetone in brake cleaner, it evaporates super fast, etc.
One reason to be concerned is its flammable range. Acetone, like gasoline and propane, has a flammable range in air of something like 5-15%. It has to be right to fire. Ether is something crazy like 3-50%. That must be why it is used as a starting fluid, because it will fire no matter what the concentration might be.
I always think about when I will need to start an engine or cause a spark before I go hosing ether all around.