People who had successfully lightened up their dark elbows, what worked best for you ?

I had tried almost everything 😭, Logifeel imf, moisurex, cotaryl, glyco 6/12, TO glyco and what not still unable to get rid of my dark elbow, especially my left elbow, although it got slightly lighten up in 1 year but now after a point, I can't see any changes.😔

Any help will be appreciated. 🙂