According to this article, NASA has found evidence of a chemical substance in the Martian soil.
From the article:
NASA scientists said on Tuesday that the Phoenix Mars Lander has detected the apparent presence of a chemically reactive salt called perchlorate in the Martian soil. Perchlorate is a toxic material that's used in rocket fuel, but the scientists said its presence doesn't lessen the possibility that Mars has or once had some kind of life on it.
The article goes on to focus mainly on how the presence of perchlorate does not preclude the existence of life on Mars, which seems to skip right over the fact that Martian soil could possibly be used as rocket fuel. We should just rename that place "Chevron" and start trucking Martian rocket sand back here by the truckload.