Thank you;) The de-rusting went well:D
Butterscotch was indeed pretty dirty inside, both washers were covered with a big layer rust but the clip was intact.
The oxi clean bath worked great,her body even got more bright making the head/body mismatch even less visible
The only thing that went a bit wrong was the combing of the tail, i pulled out some of the hair:S luckely not TO much, i compared her tail with that of my FF blue bell and it looks oke.
FF butterscotch looks much beter now AND there will be no more rusting in the future:D