I have seen rats leave debris under the hood of my car but nuisance started in my Santro Xing they had chewed the top of the windscreen washer & was leaking water.
Around 6 months ago my workers poured water & cleaned a rats nest which was in my car garage,the next day i found the rats had chewed clean through my Sparco mud flaps !
But a week ago had my most pathetic experience until date. I was in my other home which is in a very secluded area. I noticed the previous day after a while of parking my dog was running around the hood of my car. Since it was cold outside i assumed the rat that came in decided to build a nest in the bay. When i started the car next day ,car sounded like it ran on two cylinders,i immediately knew the rats must have chewed some thing & the engine malfunction light also was on.
Hyundai assistance said they would come the next day as i am safe at home & it was late evening.
When they removed the plastic cover off the engine the wiring that runs into each cylinder of which two were literally stripped. Service guys patched it up & used a G scan to clear the light & see if the malfunction re appears.
The solutions - An acquaintances S class use to have expensive repairs thanks to rats,he uses tobacco but you need to wet the Tobacco once in a while & then replenish it
.They claim its working.
But i guess i found the ultimate answer which did seem to work until i dint follow it. I left the bonnet open at night,since rats want warmth & cozy area they will avoid an open engine bay
Two days i followed it but on third day since i was leaving early morning i dint bother to leave bonnet open(also mom was objecting i mite be tempting my workers to steal car battery) & third day i noticed dog was running around engine bay in the morning ,i opened the bonnet & left the engine running hoping to flush out the rat before it did any damage.
I stumbled on this solution when i was surfing online a few days ago.Seems to be a good option if you have secure parking.
Now i kinda figured why i use to see a Laura parked with the hood open in a house in Bangalore. It was not Skoda's usual car trouble as me & my friends use to joke
The most ridiculous rat damage story i heard was from a friend.
They have an old Mahindra jeep which parks in a garage earshot distance away from their home.
Apparently the rats chewed & tripped some of the old wiring which made the jeep start & run straight into the garage wall ! The engine kept running & even the headlights had switched on. The jeep engine ran all night(apparently in gear,classic diesel torque must have helped) until my friends father got curious in the morning & went to investigate.
I imagine they must have assumed a thief or something supernatural must have happened. Apparently they figured the rats had played with the aged wiring