No need to scrub, put the oven rack in a bag: it will look like new again

Next, you will need a container in which to place the tablet or detergent. In the bowl, to pour directly onto the tablet, you will put hot water so that the contents dissolve well. Of course, the water should not be too hot, otherwise you risk piercing the bag. If the tablet has not completely dissolved, you can use a fork to speed up the process.

You will need to add 3 or 4 tablespoons of baking soda to the mixture. So we will create a very powerful combination that can eliminate even the most stubborn grease. The liquid should be poured into the bag. Care must be taken that it is not too thick and that the bag is not pierced.

At this point, the bag must be tightly closed so that the liquid does not accidentally escape. Then, place the bag with the rack inside on a flat surface. The oven rack, in the bag, will have to rest for about two hours. If it is very dirty, extend the time, for example, let it rest overnight.
Once the necessary time has elapsed, remove the oven rack from the bag and rinse it under running water. It will not be necessary to scrub it. It will be like new and ready to be used again.