She's found hairs between the sheets, cigarette ashes in a non-smoking room and even bloodstains.
At times, it's a dirty job, but someone has to do it. So how does Guerrero prepare? She took InsideEdition.com behind the scenes this year.
"These ... hotel stories are always as gross as they look," Guerrero said, "which is why I wear gloves."
However, she says she got a nasty surprise after 2018's shoot.
"Last year, in Minneapolis, I brought home some creepy crawlies with me on my boots," Guerrero said.
So now she's sporting some extra protective gear: Booties.
Check out the video above to see more of how Guerrero preps.