How do you clean the slab, sanitize and mask any odors?

Order it in the color you want!

Any coating you get is not going to help it is going to mask the problem.

Oakland that was painted like the American flag and all the colors of the rainbow inside. 

If the buyer is asking me to use things (paint colors, fixtures) that are highly customized but can easily be changed, I would include something in the addendum making the buyer responsible for paying to change those things if he backs out.

If you're keeping the siding you could just repaint a new color like light blue or dark grayish blue for window trim just do simple frames and for light blue paint window frames trim and outer doors and dark blue including garage door make sure to match garage door with front door it looks sloppy when they don't match. if you're changing the front you could try flat stone in charcoal grey and match the siding on the sides do the house with same paint color.

Also some LED designs will allow for choices in color of the bulb.As for fixtures, for path lighting you will need to decide between a fixture that directs lighting downward (fixture shape resembles a mushroom) and having a highly visible light source (fixture has the bulb directly visible or visible through glass).

The color mix I usually use is white trim with a beige or grey walls.

The dark stain masks the stains etc...never saw poly over paint before.

I want to buy the materials for the project, please give me access to all your vendor accounts""I can pick out fixtures/colors/trim myself, I don't want to pay your designer to do it" (This is more a problem with the higher-end custom work.)"