diff --git a/src/include/units/customization_points.h b/src/include/units/customization_points.h
index 02237684..5ff0306d 100644
--- a/src/include/units/customization_points.h
+++ b/src/include/units/customization_points.h
@@ -57,86 +57,4 @@ struct quantity_values {
   static constexpr Rep max() noexcept { return std::numeric_limits<Rep>::max(); }
 };
 
-
-
-// // isnan
-// namespace isnan_impl {
-
-//   // non-ADL lookup block
-//   void isnan(); // undefined
-
-//   template<typename>
-//   inline constexpr bool has_customization = false;
-
-//   template<typename T>
-//     requires requires(const T& t) {
-//       { isnan(t) } -> bool;
-//     }
-//   inline constexpr bool has_customization<T> = true;
-
-//   struct fn {
-//     template<typename T>
-//     constexpr bool operator()(const T&) const
-//     {
-//       return false;
-//     }
-
-//     template<typename T>
-//       requires treat_as_floating_point<T>
-//     constexpr bool operator()(const T& value) const
-//     {
-//       return std::isnan(value);
-//     }
-
-//     template<typename T>
-//       requires treat_as_floating_point<T> && has_customization<T>
-//     constexpr bool operator()(const T& value) const
-//     {
-//       return isnan(value);  // uses ADL
-//     }
-//   };
-// }
-
-// inline constexpr isnan_impl::fn isnan{};
-
-// // isfinite
-// namespace isfinite_impl {
-
-//   // non-ADL lookup block
-//   void isfinite(); // undefined
-
-//   template<typename>
-//   inline constexpr bool has_customization = false;
-
-//   template<typename T>
-//     requires requires(const T& t) {
-//       { isfinite(t) } -> bool;
-//     }
-//   inline constexpr bool has_customization<T> = true;
-
-//   struct fn {
-//     template<typename T>
-//     constexpr bool operator()(const T&) const
-//     {
-//       return true;
-//     }
-
-//     template<typename T>
-//       requires treat_as_floating_point<T>
-//     constexpr bool operator()(const T& value) const
-//     {
-//       return std::isfinite(value);
-//     }
-
-//     template<typename T>
-//       requires treat_as_floating_point<T> && has_customization<T>
-//     constexpr bool operator()(const T& value) const
-//     {
-//       return isfinite(value);  // uses ADL
-//     }
-//   };
-// }
-
-// inline constexpr isfinite_impl::fn isfinite{};
-
 } // namespace units