By far the best thing I have found to remove persistent oil and gasoline or diesel spills from concrete or pavement is BIOSOLVE. You mix it with water and apply through a garden sprayer, hit it with a hard bristle brush (a roofing brush works great) and the surface isleft clean and free of residual slickness. I have also utilized it through a pressure washer with great success! Once gallon more than enough for small spills (product is concentrated) Also, it is environmentally friendly and easy to work with.
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If you choose not to use thinner due to the environmental considerations try utilizing a specialized environmentally friendly hydrocarbon mitigation agent that works with both hydrophobic (does not mix with water) and hydrophillic (mixes well with water)consituents. You can then clean the brushes with a water based cleaning solution. This helps to prevent damage to your plumbing as well as to our environment.
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Novice
