Use a mask or rcspirator to protect yourself. Toxins can be absorbed through the skin. Hazardous products containing irritants or corrosives will injure the skin and then are absorbed. Some hazardous chemical can be absorbed without causing any damage to the skin. Your eyes also are vulnerable to injury.
Many hazardous products can cause eye damage if splashed into the eye.
Oven cleaners, drain cleaners, and paint thinners are just three examples. Wear goggles when working with these products. Regular eyeglasses do not provide enough protection. The lenses absorb the vapors and then hold the irlitant against your eye. Safety goggles are inexpensive and can be purchased at hardware, automotive supply and farm equipment stores.