Because it is anti-bacterial?
(Just curious, cuz I use it every day to wash dishes).
I don’t know exactly why but I spent last week end in a hospital. The housekeepers ALL had Dawn in their supply carts. When I saw the majority of the techs, aids, etc. washing with the Dawn. I mentioned it and was told it was best for actually getting rid of bacteria, germs and molds and doesn’t dry out your skin like the alcohol based steri- wipes do. I looked back in history and figured if it is good for cleaning ducks and seagulls it ought to be real good for us.