What to remove in engine bay to help heat soak?

AlphaSnacks

I read a thread, which I can't find now, where someone mentioned that removing a few pointless plastics in the engine bay will allow the built-up hot air to escape faster and easier, thus minimizing the heat soak that is such an issue with our cars - especially when the weather is warm and the sun is out.

Does anyone know what those pieces were?

One thing I'm also very likely to do is cut ports or vents into the undercarriage plastic to allow for the heat to escape from the bottom of the car, as well. I've also noticed that heat soak, and by association, some loss of power occurs only when the sun is out, so if there were an effective way of allowing the engine bay to 'breathe', it'd surely help the issue quite a bit.