Door Latch Assembly Question

OK, let me understand this. I buy an old "A" body to restore and it has a gas tank 1/2 full of bad gas. I recover the old gas, not pouring it on the ground. I use it to clean parts over the next couple of years and either let it evaporate or recycle with oil changes. In the meantime I am not spending my money on "friendly" stuff. I finish the car and fill it with 92 octane. I do a 75ft burnout and back off at 130mph. I park it back home where the 92 octane continues to evaporate from the tank. So you're saying that washing small parts in old gas is dangerous?