Fracking for CLEAN energy?

Issues with fracking for oil wells are that the solution used to extract oil from the cracked rock has so many toxic chemicals in it. When used, the solution and oil would leak into ground drinking water and contaminate it. If it's geothermal thoeretically the solution used should just be sand and water and wouldnt cause aquafer contamination. But I'm just some person with a Chem e degree from the internet let the people who are in the industry figure it out. Lol