Chemical and biological methods can be used in conjunction with mechanical means for containing and cleaning up oil spills. Dispersing agents and gelling agents are most useful in helping to keep oil from reaching shorelines and other sensitive habitats. Biological agents have the potential to assist recovery in sensitive areas such as shorelines, marshes, and wetlands. research into these technologies continues to improve oil spill cleanup. Subpart J of the National Contingency Plan (NCP) establishes the process for authorizing the use of dispersants and other chemical response agents, which includes the NCP Product Schedule, which is the federal government's listing of chemical countermeasures that are available for use during or after an oil spill response.