5% Acetic Acid

Sounds very sciency, however, you probably have this product already in your home.  It is commonly known as White Vinegar.  Cleaning Vinegar is a higher concentration of Acetic Acid (up to 10%) and can cause mild chemical burns.

According to Canadian Regulations this product is not Hazardous.

Check out a MSDS from for 5% Acetic Acid from VWR.