Can I reuse marinade that chicken was in?

Online Answer
For food safety, never reuse a leftover marinade or serve it as a sauce.
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But Le Creuset makes a limited lifetime guarantee on all of its cast iron products, meaning if the heavy pot somehow breaks during normal use in the kitchen, the brand will send you a replacement free of charge.
Use Your Stove. Turns out the best way to reheat those fries so that they're not just edible but absolutely delicious is to reheat them on your stovetop, just as you would with your leftover pizza. Spread them out in your best heavy skillet to ensure maximum crispiness (cast iron being the sine qua non, of course).
Investing in this kind of cookware is completely worth it if you spend a lot of time in the kitchen or use your dutch oven more than once a week. It uses only the best materials, and your Le Creuset collection will only get more valuable over time, especially if you've collected some hard to find pieces.