Thirty-five years after the Vietnam War, a $300 million price tag has been placed on the most contentious legacy still tainting U.S.-Vietnam relations: Agent Orange.

A joint panel of U.S. and Vietnamese policymakers, citizens and scientists released an action plan Wednesday, urging the U.S. government and other donors to provide an estimated $30 million annually over 10 years to clean up sites still contaminated by dioxin, a toxic chemical used in the defoliant.