Would it be wrong of me to not clean up this oil mess my brother left?

My brother and I bought a house is 2017. I lived there with him for a year. I moved out in 2019 and just moved back in a couple of months ago, and im living by myself because he moved to another city. Well, he had a big van, and he let it leak oil all over the cement driveway. It's like two 3'×3' spots. When it rains, it flows down into a puddle, and I can see the oil in the puddle. I'm afraid animals are drinking out of it and being poisoned. My brother says I'm overreacting but I don't think I am. I could get some of that kitty litter stuff for oil spills and clean it up, but that would take a lot of bags. I'm unemployed, and I just don't think I have the money right now.

Would it be wrong of me to not clean up this oil mess my brother left?
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