EF delete Many-To-Many rows at non-mapped entitys tables

gistfile1.cs

        public void RemoverCondigoBarra(CodigoBarra codigoBarraa)
        {
            var set = (((ApplicationDatabaseContext)_context).EfDatabaseContext).Set(typeof(CodigoBarra));

            var remove = set.Remove(codigoBarraa);
        }

        public void RemoverFoto(Foto foto)
        {
            var set = (((ApplicationDatabaseContext)_context).EfDatabaseContext).Set(typeof(Foto));

            var remove = set.Remove(foto);
        }