If you're talking about the rollover lanes, they shouldn't have capacitors.

How did you clean the switches? These old switch contacts are usually black with oxidation and will not respond to the dollar bill trick or cleaning with alcohol. I use a Dremel with an abrasive buff (like a 3M scotchbrite pad) and give the contact a very short burst at the lowest speed. This should be enough to clean off the oxidation without damaging the gold plating.

You have nothing to lose by trying this. Worst case scenario is you take off some of the plating and the switches become unreliable and need to be replaced, which is exactly what you are facing now.

Are you cleaning with a business card or similar? The gold contacts can be ruined if cleaned with a flexstone as one does with EMs.

Thanks for clarifying. Yes the star rollovers will probably have capacitors since the ball travels over them at high speed.

Take a look at the contacts on the switch leaves. If they are black, the business card method is not working, you will need to try something more aggressive. As Jeff said, don't use a file since it will remove the plating, but if you're careful with something like Scotchbrite you can remove the oxidation without damaging the plating.

If this doesn’t help and the switches are so worn from use that the gold flashing has worn out (or they had been cleaned with something too rough) you might try tweaking one or both blades just a tiny bit so the points contact each other at a “fresh” spot.

Just replace the switches or the contacts on the switches. No telling what these switches have gone through in the past 40 years. I just replace all the switches or the contacts as a matter of course these days as it saves a lot of trouble down the road.