Some very reassuring comments on here.
I don't think any of us would disagree with the application of plenty of TLC if it's used over winter, and Roger seems to have the best opportunity with a double storey garage, the jammy get..!
One thing I can say for sure is that the cars are better protected than any of my bikes, and I did the same with them over the winter..
For me, it'll be ACF-50 where I can reach, with a Hozelok plant spray hosing upwards before putting away in a heated and de-humidified garage. The TLC part will have to be on a dry day on the drive, with axle stands.
Dave W's right. They'll outlive us so enjoy them whilst we can.