1. Burning: Where you literally burn the oil, to remove it. (Note this can cause pollution)
2. Mechanical methods: Uses skimmers and booms which suck/scoop up the oil.
3. Chemical methods: Releases chemicals that slowly eat away the oil, or cancel it out.
4. Biological methods: releases nutrients, enzymes, and etc. that speeds up biodegradation of the oil.
5. Natural methods: Letting it naturally go away. (cheapest method but takes the longest)