I have mice in my Ford Econoline 150 high top van that I repelled but think I hear something in the ceiling... Is there any space they can crawl up there? (not outside on roof, I checked)... I'd imagine it's just a sheet of fiberglass and the upholstery w no crawlspace but I think I'm hearing stuff and when I touch ceiling(upholstery) a dust flakes off and I notice a white powder like (dried pee) substance in the fingerprint... Scary .. possible mice in the ceiling? Is there crawlspace ? Thank you

Try a peppermint spray for just this purpose. They're readily available. And of course, mouse traps would be my go-to flavor.