Back in the old days, before every phone had a GPS system and Siri to boss you around, we used an aging GPS gadget we named Bib (for "bitch in the box") that we'd bought secondhand.
Bib at the time was about 7 years old. She had an electrical short in her end of the connection that plugged into the car. For a few months we got her to work by (I swear) licking the leads before plugging them into her. Doing these steps in order was critical, as getting them reversed once caused me to take the charge from the car battery through my tongue. Which hurt.
Anyway, as it worsened, any bump we'd hit would turn her off and then she'd have to reboot, and find satellites, and we'd have to re-enter directions... you get the idea.
Of course, this happened once in a city we were entirely unfamiliar with, and were already having trouble finding our way around.
Bib, however, wasn't going to reboot this time. We pulled into a Target lot, and futzed around. But Bib was gone. Putting water, saliva, Diet Coke, whatever, on the contacts worked for about 10 seconds before she shut down again.
Since we were outside the store I figured I'd go in and see what they had for new GPS systems, when I had an idea.
I bought a small tube of K-Y jelly, and went back. Mrs. Grumpy was laughing hysterically at me, but I put a glop of it on Bib's electrical connection AND IT WORKED. Bib got us back to the hotel, and worked fine for the rest of the trip.
So, for the rest of the time we had her we kept a little tube of K-Y in the GPS gadget's bag, carefully applying some before attaching the cord.
At some point we left Bib, in her bag, with the K-Y, either at a Goodwill or E-waste collection. Someone out there opened the bag and is probably still wondering about it.