These events could be related.
I once had a diesel fuel container tip over in the trunk. At least 10-15 litres came out, and flowed down into the passenger-side rear seat floor. It was a terrible mess. We went through bags and bags of kitty litter, used lots of laundry detergent, and drove with the windows open all summer. The terrible smell finally went away.
About a year later, the battery would be dead if the car sat for more than a few days, and we noticed that the annunciator on the dash kept claiming the rear passenger door was not closed.
We took it to a VW expert, who said the contacts on the "door computer" were corroded, causing the door computer to lose periodic contact with "the mother ship," which caused the other computers to go crazy looking for the forlorn door computer, causing the idle battery current to rise from a few milliamps to several amps. He charged us $2,000, and soldered the contacts, and the dead battery problem went away.
About another year later, the front passenger door began showing the same problem. We put it on the market for about $1,000 under market value, carefully explaining the problem to the eventual buyer, who agreed that for the discount, he could keep it on a trickle charger and live with the annunciator saying the door was open.
So bottom line: with the prevalence of modern electronics everywhere (who knew that each door had its own computer?), corrosive fluids and gasses can certainly foul up electronics.
If this problem really bothers you, you may want to sell the vehicle — diligently disclosing the mishap, of course. Or you may just decide to live with the problem. But from my experience, it may come back in some other form, later.