Originally Posted by eHow Home
Muriatic acid (also called hydrochloric acid) is one of the most dangerous chemicals available for amateur use in the home. It is not a primary solution cleaning product, but rather a last-resort for removing stubborn stains on badly discolored concrete. When acid washing your garage, be sure to exactly follow the product instructions based on the specific brand and strength of muriatic acid you purchase.
Yeah I think I'll start with something a bit less...uhhh... fatal?