Saint in A Can

Apparently, you can purchase St. Michael and Our Lady of Guadalupe in a spray can. I'm not entirely sure how they got there in the first place, but the can states it's "100% Genuine". Another fact I'm still pondering is what you are actually supposed to use the spray for. Michael is pictured with Satan who is cowering. Being curious, I opened the top and it smelled pretty bad, which made me rule out that it was air freshener. Maybe Satan is offended by bad odors...who could blame him?