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There are a few reasons why your car might smell like fish. Fish could have been at one point stored in the car.
Leaking heater core
COuld b a dead mouse inside the cabin air filter
car smells of gas inside and out
It probably has a leak, possibly from the heater core.
i believe your heater core has died
If it is not actually over heating, then if the smell is outside the car, look for coolant leaks around the head and the thermostat cover. Inside the car could be a leaking heater coil.
Check for oil leaks on the Camry. Especially look for oil on the exhaust, as the smell can come into the car.
It could be a bad fuel pressure regulator.
the inside of your car will smell like exhaust if you have C.F (cabin filter) in you car and it has not been changed recently This may sound dumb, but some people may miss it. If you have a car in front of you that smells bad, or are in a smelly environment, and you don't have the recycle air button on, "fresh air" will enter the car.
Your heater core may have a leak in it, allowing the fumes to invade the inside of the vehicle.
It's because you eventually get used to the bad smell. You should try to get rid of the smell using fabric spray, ozone generator, etc.