When I bought the car from a guy in Sacramento I had it shipped over to me in England and it was in "as bought" running pulled out of a yard/barn condition, a friend picked it up and put it in a container and the next time it saw daylight was here in the UK.
The first thing I did was clean it and I removed a huge quantity of walnuts, probably two wheelbarrows full and they were all eaten, just the outer shells left.
Problem was the shop vac wouldn't suck them up so I had to remove them all by hand.
Then I removed the seats and got another half wheelbarrows worth out.
Next job was to work out why none of the side windows didn't go down, yup, walnuts, the doors and 1/4 panels were full.
When I decided to do the heaters I knew what I was going to find.
Strange thing is that I never found a single dead rodent, no little skeletons, no remains, nothing. just nests and nuts.
All told I pulled at least 4 wheelbarrows full out of the car (not heaped by the way, level). and my seat wadding was in the rockers and above the headliner.
Next job is to gut the interior, steam clean the floors and roof and replace everything soft.
Car itself drives like a dream though and although she a little smoky its reliable.