Watch this tip...

http://www.ehow.com/video_4766912_gasoline-out-clothing.html

Here is a link that might be useful: Gasoline out of clothes

No need to wash the washer or dryer. With three washing it should removed most to all scent of spilled gasoline. In the near future, Prewash and Regular wash with your detergent will do fine with the warmest water temp according to garment label.

I have posted several times in this forum, if you use Lestoil, to get rid of scent:

1: Rewash garment with your favorite detergent.
2: Use 1 Cup of Baking Soda with 3/4 cup of Vinegar in the first rinse.
3: Use your favorite fabric softener in your second rinse.

The scent from garment and machine is greatly reduced to little or no residue of Lestoil or other oil based products.
Since gasoline is oil based, the same technique above would apply.

The only danger has already passed since you have already dryed the items in the dryer. The danger is that lingering volatiiles in the clothes would ignite in the dryer's heat. Hard to imagine how they'd still be there after 3 washes, but it's theoretically possible.

You apparently didn't blow up your laundry room, so all is OK.

In the future you could hang the clothes to dry so the solvents can evaporate into the air, away from a source of ignition.

L.

Thanks Everyone!