Acetone is not extremely toxic to humans, in fact it has a very low toxicity. 

Yeah, maybe very low to everything but one organ - skin.  In the early building years, when I was even more ignorant than I am now, I frequently cleaned my hands with acetone.  Several years later the skin on my fingers would not self lubricate and I suffered continual cracks on the working surfaces of my fingers - severe cracking during the winter.  Now, 10 years later, I have almost completely recovered except for a spot on the road rage response finger.  I cannot allow my unprotected hands to come in contact with any "spirits" (gasoline, etc) without the skin instantly drying out. 

 

Grayhawk