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

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.