UPDATE: you can follow a step-by-step guide to de-lighting in the PhotoScan 1.4 pre-relase (written by Agisoft themselves!) on the Sketchfab Blog: https://blog.sketchfab.com/delighting-3d-scan-agisoft-photoscan/
A quick comparison of a model processed in Agisoft PhotoScan Professional before and after using the new delighting tool in the 1.4 pre-release build
I used the default settings and think the results are pretty amazing! A one-click solution for delighting.