Rats bedding down under car hoods is nothing new for New Yorkers...
It is for non-New Yorkers! Personally, I'd see if I could weaponize your polio virus into rat poison but if sounds like you're at peace with the rats.
...“I see new cars, old cars, everyone is coming in now with these rat problems,” said Ozzy Dayan, a mechanic at Manhattan Auto Repair in Hell’s Kitchen. “It brings me a lot of business, but it’s disgusting.”