On the topic of baking sheets, there is one in particular that most all of us own. If you're like me, you still use it a few times a week, and it still works perfectly fine! Signs you need to replace your cookware include visible scratches, warping or dents, loose handles, and spots with rust. To get the most out of your cooking sets, be sure to always handwash them and towel dry them. Another way to prevent damage is by using wooden or rubber utensils vs. metal for stirring or flipping whatever you're making.