Was looking at the service manual for my car - maintenance item, replace spark plug leads every 60,000 km. But it has one of those bolt-on assemblies which integrate the sparking system and four tubes which fit over the plugs. ¯\_(ツ)_/¯
I used to have it serviced by the dealer to keep the warranty. Every service report had "complimentary car wash". It was never done as far as I could tell.
