ive been sanding floors for 12 years but have never pickled a floor. how do i do that? thanks!! what i want the end result to look like is almost as it has been painted white

There's a guy in Australia that posts to another forum and he actually uses watered down latex paint. Kinda like a white wash.

make lots of samples and charge accordingly its a extra couple of steps and watch out for fading/yellowing. Some peps bleach it white some paint it white with paint. Be aware too that if that floor opens up any during the winter and dust and other crap get in the cracks it will show up like a pin stripe. thats what I remember the most, after one winter many of them look awful.

Dura Seal makes a white stain. We have used it and it a couple times and it has turned out really good.

That can totally work , as you know . If you thin your paint you can do up to two coats and make the floor almost opaque white . I watched a painting specialist paint a floor black.The first coat of latex looked pretty blotchy but after his second coat, it evened out perfectly.
Most of us contractors hate water based stain so we use Bona white or Duraseal white and the weekend warriors use minwax all of which are solvent based . However, Minwax does have some water based products including white . So :

Sand the floor normally and apply white solvent based stain- = only a little white
Sand the floor normally ,pop the grain with water and stain- = much whiter
Sand the floor normally , pop the grain with water and coat with thinned latex = almost opaque white.

Back when white wash was popular, and we couldnt get a floor white enough by bleaching....We were using white laquer, for an ultra white look. I don't know if it's still available...but I remember it was a bear to apply without showing lap marks.