I know, old paint shop employee. We lived in our own little smurf world (blue uniforms) and other people couldn't come in (unless they were Pinin bigshots). The contaminants isn't really an issue in reality, taking a forklift for a trip outside and back again introduced way more foreign objects than some camera people dressed in Tyvek would. Not to mention the maintenance staff who crawled around everywhere when stuff failed, they had to wear their uniforms and never bothered with the Tyvek. But contaminants is a good sweeping reason to not show your process.