Cleaning indoor concrete

I took a job today cleaning indoor concrete for a business. They used the space (480 sqft) for storage and want to convert it to additional office space and needed to clean prior to coating.

I booked it for next week as I don't like saying no to a job, but it was a little odd. The description is that there are no rust stains, 3 year old concrete, and just soiled from foot traffic. Seemed like an easy job for a high alkaline cleaner, orbot scrubbing, and rinse out with spinner so I bid it at a 2.5 hour rate....they gleefully accepted which always worries me.

She told me that they were going to rent a psi washer and shop vacs, but that they really didn't want to do it themselves and there are no cleaners in that small town (less than 30 miles from me). To add to the oddness, they repair driveways and do road paving so you would think that they would know their concrete enough to just knock it out themselves, but the owner said that he wasn't going to waste his labor when they could be out in the field making money. Makes sense at this point.

I think I might have some OXyblaster left on the shelf, but will likely need to buy additional stock of something. Any suggestions?

I picture asphalt foot traffic all over the places you may want to btake some muratic acid...ventilate

I am picturing a few things as well. It sounds like they already started to renovate it for office space, so I am also envisioning lots of drywall dust or 3 years of that oil dry sweep built up in the pores.

I will go loaded for bear as usual, but I am hoping to get away with just a good alkaline cleaner....not sure which one to use right now though. I don't like using D-Lim nor anything that might etch the concrete since many coatings have a problem with that surface prep. Just a good high alkaline cleaner....could throw a little stripper in there if needed as well.

Scrub it with a good hardy pad. Enough to remove ever so lightly layer of concrete. I saw the difference in a warehouse business from doing that vs. NOT.

Thanks for the suggestion Matt, I will give that a try.