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Yes, you can remove oil stains from your driveway by applying an absorbent material such as baking soda, sawdust, or cat litter, pouring on a liquid detergent such as dish soap, scrubbing the area, and rinsing with water. You can also use a diluted bleach solution, white vinegar, or TSP solution on concrete.

A 4-inch-thick concrete slab can support around 4,000 pounds per square foot if a contractor reinforces the slab with rebar, while that same slab without reinforcements will support closer to 1,000 pounds. For the purposes of a patio, 4 inches in thickness without reinforcement should suffice unless you’re installing heavy kitchen equipment or a hot tub on it. In those cases, reinforcing your slab and sticking with 4 inches of thickness should provide plenty of strength.

You don't technically need rebar for a concrete patio, but it's a good idea to install it, especially if your patio will support any heavy items. All concrete is susceptible to cracking, and rebar keeps cracks in check while maintaining a smooth, level surface. Without rebar, cracks will likely widen and cause the concrete to become uneven, compromising its structural integrity.

The cost to install a concrete driveway is $4 to $15 per square foot on average. Your price heavily depends on your desired concrete finish and driveway size. 

For a driveway that is 200 square feet, you can expect to pay an average cost of $1,900. For a driveway at double that size (400 square feet), the average price is closer to $3,800. Plain concrete is significantly more cost-effective, averaging $7 per square foot, whereas stained concrete averages around $19 per square foot.