Place both kinds of Chex and pretzel rods in a large bowl.
In a small bowl, mix together melted butter, lime juice, tequila, and powdered sugar until smooth.
Pour butter mixture over Chex and pretzels and toss until all of the Chex and pretzels are coated.
If the Chex Mix sits too long, it may get a little soggy. You can revitalize it by spreading the Chex Mix in a single layer on a cookie sheet and lightly toasting it.I found that the Chex and pretzels had enough salt to make the recipe balance nicely. However, if you are a salted-rim margarita fan, you may want to add salt to the recipe.If you will be serving this at a party with children, it's OK to leave the tequila out. It will still taste good.If you live in a country where Chex is not available, you can use another cereal for the recipe, like shredded wheat or flakes.