How about a job where the cleanup after the job is the dirtiest. Well I've done just that. I worked at a local shipyard as a welder. I helped fabricate Navel vessels. Well twice a year the plasma touch table needed to be cleaned and repaired. Now this table is about 20 ft by say 50 and 3 ft deep(I forget the actual measurements)any how, the black sludge needed to be scraped scooped and hosed out. We would where Ty vex suits ( multiple suits at once) just to keep the sludge from soaking into not just our clothes but our skin. I know this now cuz my 1st time doing this job no one told me the out come of not covering up correctly. After 8 long hours of cleaning. I had the normal splashes and dots of sludge on my face arms legs and back. It wasn't until I returned home for my much needed shower did I find out the these dots didn't come off. no matter the scrubbing or scouring I did. And I mean nothing. Also the sludge worked its way threw my clothes so I had dots of all sizes everywhere. (including some private parts, Damn I looked like a bad rendering of a leopard.) It was 3 days before they all disappeared)