Maybe a tub would be less because of less chemicals, but I'd really think twice about having one of these.

I don't know what the chemical makeup is of the primer advertised to allow tiling over tile, but I am hoping it is a self etching substance that dries with a tooth.  

get it really clean and wire brush it or use some kind of chemical to lighten/brighten it?

On a typical move-out/move-in job I had my "standard" tool box plus a materials box containing;the standard paint color I used for rentals-Navajo White, a bunch of paint stirring sticks (for sheetrock repair more than stirring paint), a couple of pieces of sheetrock 2' X 2', Elmer's glue, sheetrock screws, switch plates, a couple of outlets and switches, scrubbing stuff and chemicals, DOORSTOPS, light bulbs, mineral spirits and linseed oil and 000 steel wool for touching up stained wood, paper towels, TOILET PAPER, rags, paint brushes, SMALL LADDER, joint compound.Once you've gone through every room doing the "touch ups" you'll have a good idea if you need to come back with your 8' and extension ladders, paint rollers and 5 gallon can of paint and drop clothes.

You might want to talk to a company who deals in hazardous situations and clean up like chemicals as well as body clean up, such as after a person's death on site.

Once the chemicals attach to a surface, it chemically bonds with it.  

After cockroach extermination and removal of another pest from your unit, you can perform all the pending activities as a pest control activity will leave behind pest traces and used chemicals all over the unit.

Ozone works by chemically neutralizing he odor molecules.

He then told her she was going to have to buy a overflow that was going to cost about 1100 due to the chemicals that flow down the sink.

The chemical smell of lacquer and paint was too strong to smell anything else and when that calmed down, still no smoke smell.The light fixtures will cause problems if you don't clean or replace them.