While doing a project for EPA, a friend and I were in Davenport, Iowa, and after taking pictures of the Davenport dump.. (another story).. we stopped at a small diner. Ordered something, then I leaned back and happened to glance up. The ceiling was the drop-type with panels in a metal frame. From many (12-15) of the corners was hung a Shell No-Pest Strip.... (diclorovinyl-dimethyl-phosphate)!!!
https://www.reddit.com/r/nostalgia/comments/14n1r34/shells_no_pest_strips_who_e Dichlorvos (2,2-dichlorovinyl dimethyl phosphate, commonly abbreviated as an DDVP[1]) is an organophosphate widely used as an insecticide to control household pests, in public health, and protecting stored products from insects. The compound has been commercially available since 1961. It has become controversial because of its prevalence in urban waterways and the fact that its toxicity extends well beyond insects.[2] Since 1988, dichlorvos cannot be used as a plant protection product in the EU.[3]

Yes, we ate our lunch... quickly...