I tried a new lavender scented lotion once, washed my hands after I applied it. When my chin came up to me when opened her cage, she took one whiff, made the funnest face ever and proceeded to hate me till I threw the lotion away and took many showers.
I'd say they are very sensitive to smells, esp man made ones. They also have delicate respiratory tracks. If you have an odor issue I'd go with something that absorbs smells, like a box of arm and hammer in the closet, and no sprays or plug-ins in the same room. If its the chins causing the stink try cleaning their cage more frequently (easy to do if they pee in one spot) to see if that helps.