I can tell you what not to do.
Don’t ask this most complicated and important question on the internet and expect a one opinion answer.
Rather, go to your Rav or to a respected Rav that you trust and ask him for advice on what to do.
There are opinions that you can pour boiling water on the formica after it’s scrubbed with cleanser and waited 24 hours and there are opinions that you need to keep it covered since you can’t kasher it.