I can explain. I soak cat food cans - my city requires that they be rinsed, but if I rinse them right after emptying them, they do not rinse well and I have been known to get scratches - so I soak them in a pan overnight and next day they are completely clean. So for me throwing a bottle in a pan in which I am already soaking empty cans is no big deal.

If you do not soak anything, then a lighter is more convenient.