Mouse Poop in Cab Corners

[AlbertaClassic]

Hey all, I appreciate in advance any help anybody can offer on this. I bought a 2001 Sierra 2500HD Regular Cab Long Box. Bought it off a local farmer to be a DD for a year or 2 and then the use with my construction business. It came from a feedlot, so thought that explained the smell. I aired out for a couple weeks on vacation after getting it home, but the smell got worse. I dropped the headliner, pulled out all rear trim and floor mats, seats, etc. Found large mouse nest on headliner, and in cab corners and possibly under rockers. My question is, is there a savvy way anybody has to vacuum the hollow in the cab corner down through the rocker and what to put down there to get smell out?

I’ve been vacuuming, bleaching, and baking soda on and off for a couple weeks with no solutions. No upholstery or carpet in the truck anymore, I removed the cab air filters and everything that would hold smell. The smell has gone down to be somewhat tolerable, but wondering what people would use to deodorize at this point in time. My daily driver now is sold and leaving next week so hoping to figure out soon. All help on this issue is much appreciated. Thanks.
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