Does anyone have any suggestions for a good odor eater product for the grey water tank on a LQ trailer? We just bought our first LQ and traveled this past weekend with it and the dirty tank started to smell quickly (was cleaned prior to travel so it is not from anything sitting in there over time).

They make a citrus smelling grey water tablet for the grey tank. You let it dissolve in sink and flush it down. Really helps. I have also used the Black tank liquid treatments in the grey tank as well.. Won't hurt anything. Also, when your parked at home and the tank is empty, open up the valve to the open air and let it sit a few days to air out. WIll usually kill any bacteria in there 

I dissolve an odor tablet (RV section at Walmart) in hot water and pour down toilet. Follow with  a touch of liquid fabric softener. Pour a couple of tablespoons of same fabric softener in shower and sink drain. You will stay fresh as a daisy. Use Angel Soft toilet paper.

I leave my drain valves open when not in use so they stay aired out

Shungite. It's a black rock water purifier and silver tensor ring also a water purifier. Either one can be left in the water or placed outside of the water. Shungite immediately kills bacteria and removes chlorine, fluoride . Silver  tensor rings placed in water kills bacteria, and restructures the water and purifies in 48 hours both leave water tasting clean and sweet.