ESTCP released a solicitation on October 17, 2019, requesting proposals for demonstration and validation of environmentally sustainable technologies or methodologies for cleaning firefighting delivery systems in aircraft hangars or on firefighting vehicles that have contained per- and polyfluoroalkyl substances (PFAS)-based fire-fighting foams. The solicitation closed November 21, 2019. FY 2020 funds are available through a competitive process to both Federal and private organizations.