The skin, which is the largest organ, absorbs many substances that come into contact with it and sends them to the lymphatic system, blood and other organs, such as the liver, according to the book Ayurvedic Nutrition. And the respiratory system takes in the vapors of whatever we breathe.
A lot of companies make 100 percent organic/GMO-free household cleaners and body-care products. Nature does a good job of this too.