Spray as best you can around your roof chimney eves ventilation holes etc.
Dead rat attic flies.
In most cases a rat that is about to die will.
The smell will only get worse and more pests like flies and maggots will be attracted.
For outdoor spaces once the dead rodent has been disposed and the area is cleaned the smell should disappear within 24 to 48 hours.
Blowflies are described by wikipedia as medium to large flies but i would describe them more as flying bookends.
I realized instantly that the dead rats had become a breeding ground for blowflies.
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If flies seem to be hovering or landing near a specific area on a wall or floor try a sniff test.
How to get rid of a dead rat smell locate the source.
Apply insecticide to the outside of your attic to prevent flies from coming in.
Know the most common areas you will have a better chance of finding the dead rats in your walls or attic quickly if you know where to look something which comes down to an understanding of rats habits.
Do this in the summer or early fall at the latest.
As soon as you notice what you think is the dead rat smell start looking for an increased presence of flies maggots beetles and other insects that are attracted to dead animals.
Remember attic flies want to cluster indoors when it starts to get a lot cooler outdoors.