This undated photo taken from an Instagram posting shows an overlook of Crater Lake in Oregon with a rock painting. The National Park Service is investigating paintings and drawings of eerie faces found on rocks across the West in some of the country’s most recognizable wilderness areas, including Crater Lake. 

Graffiti at national parks needs painstaking removal

In some cases, workers use plastic kitchen spatulas to painstakingly scrape off paint.

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(AP Photo/Instagram)

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