Eliminating gasoline odor?

[subtlez28]

About a month ago I pulled a bone-head move and dumped some gasoline on my floor.



It's hard to say how much, liquid looks like a lot on a concrete floor, but I would guess less than a gallon.

Anyway, I flushed the floor off with water for several minutes. I degreased anything I thought got gas on it, and tossed out anything that soaked it up (cardboard, wood blocks etc.).

I tried to keep the garage ventilated for the next couple weeks, but the smell persisted. Eventually I scrubbed the floor down with Dawn, and thoroughly flushed it again.

It has been nearly two months, but if my garage door is shut for a few hours the smell keeps coming back.

This is a huge PITA as it has been very cold (single digits) here so leaving the door up is not a good option. Plus I don't like firing up the garage furnace and working out there as the smell is quite annoying (not to mention toxic).

Sorry for the long post, but does anyone have some miracle cure for my issue? Home remedy, wonder product, etc?