Hopefully, you will receive this message given that it has been a number of months since you posted your message.
There are a small number of Getreu's here in Melbourne Australia. We are post war migrants from Poland with some relatives in Portland OR and some distant relatives in NY.
Some time ago, I visited Ohio and spoke to a John Getreu who had a some with my namesake, Robert. Unfortunately, John was not overly excited about delving into family history and Robert was not at home.
If you get this message and want to delve further, please let me know.