I’ve been tasked with cleaning 171ksf of transmission factory floor after they’ve moved out and have to prepare for new tenant. There is literally 1/8 inch and more of black tar like material that is 30 years of cutting fluid, trans fluid, metal shaving, grease and good ole dirt. Can’t scrub it up, all degreasers have proven pathetic up to orange peal, literally scraping with 12 inch floor razors and then scrubbing what’s left. Need an expediant and economical solution for my customer as this is getting outta hand $$ wise. I’ve been doing this for 35 years and this is bad as I’ve ever seen and the sheer amount of sf 171ksf