methyl ethyl ketone (MEK) is one of those nasty organic solvents. It's a good thing it really doesn't have any use for tar removal. For example:

Methyl Ethyl Ketone can affect you when breathed in and by passing through your skin.
* Methyl Ethyl Ketone should be handled as a teratogen--with extreme caution. [Note: _teratogen_ is a medical "code word" meaning it causes birth defects]
* Exposure can cause dizziness, headache, blurred vision, and cause you to pass out. Repeated exposures, along with other solvents, can damage the nervous system.
* The liquid can severely burn the eyes and may irritate the skin. Repeated exposure can cause drying and cracking of the skin. The vapor can irritate the eyes, nose, mouth, and throat.
* Methyl Ethyl Ketone is a FLAMMABLE LIQUID