For those who still use dryer sheets for their intended purpose, I've heard this trick still works with used sheets. I'd probably try doubling up though...just to make sure there's enough of the "non sticky-ness" to do the job.
It's as simple as putting warm water into the dirty pan or cookie sheet (works best if the cookie sheet has edges...if it doesn't, you'll want to soak in the sink or wash pan), laying the dryer sheet (or sheets) flat in the water and leaving it to sit overnight. In the morning, the baked-on stuff will either have lifted off, or will be very easy to slough off with a spatula or other flat object. It has always worked for me...especially if you do it right after you've used the pan.
Depending on the dryer sheets used, this can be a really green solution, especially if using used biodegradable dryer sheets. In my case, they serve no other purpose, so putting them to use feels like the right thing to do.
Have you tried this, as well? Tell us about it in the comments below.
(Image: Michelle Chin)