Garden to detoxify greywater

I milk my cow by machine, then have about two gallons of water with dish detergent and a hint of chlorine beach to pour out after cleaning the machine. I’d like to plant a nice little garden next to my milking parlor with plants that will enjoy being watered 2x a day and aren’t too fussy about the detergent and bleach. So what sort of flood- tolerant, unkillable plant monsters can you recommend? USDA Zone 5a, temperate forest climate, shade hardy would be a plus.

And yes, I’m aware I could handmilk but my cow lets down much much better for the machine. I machine milk when she is producing 2+ gallons/ milking and then handmilk once her production drops and she gets less picky about “get it out - NOW!”.

Hello Anna.  I do not know of anything that will tolerate much bleach.  If bleach water is set in the sun vary long the bleach smell seems to go away. I have cleaned many milkers myself and understand why you use it.  The farm next to me just dumps it in their poo tank.  By the time it hits the field it has probably converted the leftover bleaches into salts of some sort or evaporated.  With most soaps things like duck weed, reeds and cattails do ok.  The duckweed needs standing water.

For plants, I think a good place to start would be to look into high ph tolerant ones.
I've planted some seedling irises that I started under the canopy of some pines in deep shade. They are growing but very slowly and will likely never flower there. They're said to be good at water clean-up and can handle high ph. I have bearded iris, but I've considered using yellow flag iris in some sort of raised bed/container for a future grey-water system project. I've read that it can handle more water and higher ph, but they are apparently pretty invasive.
Cattails are another useful but somewhat invasive plant under the right conditions. I'm not sure how much shade they can tolerate though.

Seaberry is a shrub that is tolerant of high ph and road salts, coastlines being one of its native habitats. Caragana is another higher ph tolerant shrub. I have both growing near our driveway/road where snow gets piled from the plow-pass all winter and they seem to do well there. They do require a good amount of sun though, and would likely need to be a bit mature before being able to handle that amount of water.  
Another possibility would be to make a charcoal/sand filter and run the water through that first. I like the let it sit and evaporate method as well.