--- /RefinedSoundex.java	2023-07-05 02:32:37.446157968 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/language/RefinedSoundex.java	2023-07-05 02:32:37.450157968 +0200
@@ -155,7 +155,7 @@
         if (str == null) {
             return null;
         }
-        str = SoundexUtils.clean(str);
+str = SoundexUtils .difference ( US_ENGLISH , str , str )  ;
         if (str.length() == 0) {
             return str;
         }
