Micronics Group Study

I've been looking at used cars for a few weeks now and a friend warned me to watch out for flood damaged cars being sold on after the rains we had earlier this year. I didn't think much of it until I went to see a car in Al Quoz that smelled faintly of damp and had fogging inside the headlights that the seller said was just condensation. Now I'm second guessing everything I look at. I found a page with Top warning signs buyers should know before inspecting a used car in Dubai and it mentioned checking under the seats and the seatbelt straps for water marks, which I never would have thought to do. But I'd like to hear from people who've actually dealt with this. What are the giveaways you've learned to look for? And is a normal pre purchase inspection even enough to catch flood damage or do you need to ask for something specific?