Atomic tests at the Nevada Proving Grounds (later the Nevada Test Site) show effects on well-kept homes, homes filled with trash and combustibles, and homes painted with reflective white paint. The makers of the film (which apparently include people selling home improvement products as well as the U. S. government) assert that cleanliness is an essential part of civil defense preparedness and that it increases survivability.
Related posts and links:
Fan of mushroom clouds? Dozens of nuclear test videos declassified, uploaded to YouTube.
The anniversary of Winston Churchill's Iron Curtain speech
This is fascinating: 25 years later, deer on the Czech/German border still avoid the Iron Curtain.
A Secret Cold War Bunker under Brooklyn Bridge.
In 1961, US nearly detonated atomic bomb over North Carolina
Hard to tell if there's anything to this: Nixon blocked Soviet nuclear attack on China in 1969.