car soap

I bought a bottle of hand soap with a picture of a Red Hot Wheels car on the label and a hot wheels logo on it, and put it in the bathroom. I thought Jimmy would get a kick out of it, he loves hot wheels.

Jimmy went to wash his hands and came out excitedly with the soap and asked "is this car soap?"
I replied "Yes it is" thinking that he probably could not see the picture really well.
"can I use it on my hands, or is it just for cars?"

Now he wants to wash the car with it and will not believe it is for his hands "but, mom, you said..."