I just cleaned off my hazard switch (working hazard lights are important). It was gunky and green in there. Hazard were dead, and sometimes the turn signals would go dead and I'd toggle the hazards and it would fix it.

I just used a small screwdriver to gently scrape the contacts clean, and a little isopropanol. This fixed the hazards and the turn signals. I'd recommend emery paper or fine grit sandpaper. If you just want it working this should suffice. It takes 5 minutes. There are two little springs inside the switch so don't lose them.

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1984 300D Turbo 350K 50K WVO (two tank) "Maeby"