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First delete them from the database with this:
Administration > Tools > Batch update > Search and replace

Set search method to “regular expression”
Search for : [0-9] _UID .*(\n)* (copy this carefully as all characters, including spaces are critical)
Replace with nothing

I recommend running a few using just “update” first to satisfy yourself it is catching the correct rows, and only those, then use “update all”.

Once completed, export your tree. That will create a fresh GEDCOM file without those items.

Nigel
My personal kiwitrees site is www.our-families.info