ヅラッシュ！ by NI-Lab.

private static String deleteControlChars(String s){
  // Control Codes 0 <= 001f and 007f
  StringBuffer buf = new StringBuffer();
  for(int i=0; i<s.length(); i++){
    char ch = s.charAt(i);
    if(ch > 0x1f && ch != 0x7f){
      buf.append(ch);
    }
  }
  return buf.toString();
}