2.5 Gallons of Gasoline leaked in my trunk.. Help

A lot of backing soda, and letting it sit. Then try some "Totally Awesome", full strength.
Spray it everywell, and let it sit. You've pretty much done what you could.

 

Just from a Google search:

How to Get Rid of Gasoline Smell (DIY) | Family Handyman

 

Fwiw, you're not the first person to spill gas in their car, and you won't be the last.

Try to soak up as much as you can. Use paper towels, and nitrile gloves.
You should take out the rear seat.
You may want to consider removing the front seats, then removing the carpet. Then, put only the driver's seat back in. If you use a floor mat on the driver's side, be careful it doesn't slide under the brake/gas pedal, and prevent the car from stopping.
Sliding floor mats have been an issue, with some cars in the past.

If you have a garage, leave the car windows down, and 1+ garage windows cracked open.

It'll take some time for the gas smell to dissipate. There are many factors.
It may take days, it may take weeks.
Imho, considering that it's Summer now, depending on the humidity and being able to keep the car outside with the windows fully open, most of the gas smell may go away in a week or so.

If you don't have vent shades on the car, you should get some. Otherwise, don't drive the car in the rain/etc. Breathing the gas fumes isn't good.
You may want to consider wearing an N95 mask while driving the car, if the windows can't be fully open when driving.

If it gets cool when driving with the windows open(now, possibly at night, or early morning), wear a heavy jacket and gloves. At least it won't get to below freezing now.


For vent shades:

Code:

https://www.amazon.com/Window-Visors-2010-2015-IKON-MOTORSPORTS/dp/B075ZLN6W3
Window Visors Compatible With 2010-2015 Toyota Prius, Dark Smoke Car Rain Sun Window Shade Guard Visor by IKON MOTORSPORTS, 2011 2012 2013 2014
$39.99

https://www.amazon.com/Smoke-Window-2009-2015-Toyota-Channel/dp/B07P7G8XQF/
Safe Smoke Window Visor Sun Rain Vent Guard 4 Pcs Set for 2009~2015 Prius Out Channel Visor
$48.25

https://www.amazon.com/Auto-Ventshade-94181-Ventvisor-Deflector/dp/B003M9J2OG
Auto Ventshade [AVS] Ventvisor | Outside Mount, Smoke Color, 4 pc | 94181 | Fits 2010 - 2015 Toyota Prius (Excludes V Model)
$61.13

Imho, most of the plastic gas cans today are junk.
It's not easy to find a well-made plastic gas can anymore.
Imho, there's very little/no market for a well-made plastic gas. And, the metal gas cans are heavy as heck.

Good luck.

 

Use charcoal briquets, regular ones; not the "Matchlight" type. Place them in a shallow container and put that in the hatch area for a few days. The charcoal will absorb any smell in the car. After that, on days where the car isn't driven, open the hatch and all doors and leave them open all day if you can. If you still have some gas smell remaining, place some fresh charcoal back in the car to let it absorb the smell.

 

charcoal, baking soda, kitty litter... they all absorb vapors & odor. Put them in open pans or fill a bunch of socks and use them as odor absorbers.

 

What has happened to the battery tray The HV battery the metal it sits on the bottom of the inside of the silver bottom liner of the battery tray itself you need to have a look get a q-tip a long medical type and reach in there if you're too lazy to undo it and take the cover off you can leave it in the car and get the cover off or make it so it'll lift up enough so you can see gas drives quickly so it won't be there now but you need to see if it got on the bottoms of cells generally in the tray bottom Good luck

 

Hook up a charger, or disconnect battery when doing this?

 

And if it's a Gen 3, I think I would disconnect the battery by unplugging the fat white cable in the fuse box under the hood.

Even after all the cleaning efforts so far, I might still be leery of making any sparks in the hatch area.

 

A nearby fire extinguisher wouldn’t hurt.

 

I did this once in my wife's mini-van. Yeah, she wasn't happy.

Pulling the carpet and loose padding, heavy cleaning, and hours and hours of air drying/ventilation ended the fumes.

Lesson learned: I then began putting those gas cans inside heavy duty trash bags for containment for the trip home. Now I have a full electric line of yard tools so those trips have been eliminated.

 

Get some odor eliminator and leave it inside the car

 

This shouldn't do much of anything about the fumes. N95s are for particulates above a certain size. Chemical fume molecules are much smaller, so should flow through unimpeded.

 

My advice is to just leave the window open as you drive and if you can while you park. I had a body paint job on the passenger side doors and front panel, even though it was done at Toyota authorized body shop and I got the car back almost 1 week after curing the paint, the paint smell lingered inside of the car. Since the work was done in the middle of winter, I could not keep the windows open as much as I would have liked, but after a good month or two, the smell dissipated.

We have an ozone generator used for room odor elimination. I was going to use it in the car but didn't. It works for most organic odors like the bacterial-born rotten smell or mold-born musty smell, but I didn't know how it eliminates the paint odor. The thing is that ozone has a noxious smell of its own. It is also an irritant to the respiratory system at low and toxic at high concentrations. I found the smell of paint was more tolerable than ozone.

 

I once bought something whose previous driver had been a heavy smoker. I was lucky to have bought it in warm weather.

After using a shop-vac water-extraction upholstery wand over and over and over until the detergent water stopped coming back gray and the upholstery was visibly red again, I just drove everywhere with all the windows down, the whole summer and fall until it got too cold.

Eventually, you couldn't even tell it had been smoked in.

 

Banana peels obsorb odor, that will help. Just replace them every day.
Only time will help.
Tranfporting fuel in the trunk in no wise.
I put my gas cans on the front passenger floor. And drive carefully.
Been doing it for decades and never had a spill...

 

I've had luck with charcoal in "removing" the smell in a vehicle when fuel was spilt. Rarely carry gas in cars now, but when I do it is in a milk crate, and the crate is fastened to tie downs in the trunk. Not had any issues with tipping in the last few years.