Identifying and removing unwanted scenery

I have recently installed the excellent FlyTampa Hong Kong scenery. Unfortunately I have a few grey skyscrapers which I cannot remove sitting in the water and across the main bridge left from other Hong Kong enhancements.

I have removed all previous enhancements as best to my knowledge (the last enhancement was Flightsofts Hong Kong) and can find no other Hong Kong files to remove, so is there a way to identify where these are coming from?

Many thanks

Richard