Sorry to hear that you're having trouble removing the photoscenery, and I agree that there should be an easier way to remove it.
I plan on releasing updates for all my older sceneries once X-Plane 10.50 drops. I'll update them to use my library (taxilines, static aircraft, airport vehicles etc..), use the new 10.50 static aircraft/ramp start system, and seperate orthophotos and scenery so users can remove them if they wish.