
Oh sorry I saw the image, if it is a potentiometer, you have to desolder it and then open it to clean the internal lamellae inside, use isopropyl alcohol, eye, if you do not know how to desolder or do not have notions of electronics I recommend that you take it to an electronic technician, he will know how to clean that potentiometer or selector, greetings
Now as I was seeing the image getting closer, I think there is no need to desolder it, it has 4 grapitas to hold the potentiometer lid, I believe according to what I saw, those four lamellae can be straightened to remove the potentiometer lid and they would already look the lamellae, if you see that it does not come out, do not try to remove the lid because you can damage it and you better take it as I advise you with a technician of those who repair TV, please comment, thanks and greetings
There is another option, in the electronic stores they sell a dielectric splay to clean that type of potentiometers, but the cleaning lasts a short time, there is no way to uncover them and clean them manually, also that there is no way to introduce the cleaner, it would be for the average rod cane, but little splay would come in, that splay is not very expensive, I leave it to your discretion, luck and we are in touch, I am leaving, see you soon.
Thank you very much Fermin, I do not have much idea of electronics but I am going to encourage you to get a hand when I get the isopropyl alcohol, I approve that I already have it disassembled and anyway it does not work well, then I tell you how the matter ends. Do you have any advice on how to open it? Regards.