With age I'd say that overspray is more resistant to solvents for removal. Usually within weeks. Clay is a great 1st step however can be a nightmare...
Nice video review! Wondering if you ever reapplied additional product? Just a little advice....after applying your initial coat, wipe and/or brush in...
I'd be willing to bet that the weak link is the carpeting. Good luck protecting that unless you completely cover it. Case in point....Here is a 2005...