[John in SoCal]

I've got the same problem. The truck had sat around for many years and became a rat play ground. We cleaned the rat poop and pulled the dead ones out. Used some deodorizing spray, vinegar and now baking soda. Improved a little but not enough. Eventually everything will get pulled out and cleaned or replaced. In the mean time I'll just try to make it better. I'll be trying some of the suggestions I have seen here. Hopefully I'll have some luck.