Tyres and wheels (classic cars)

Hi Guys

I need some advice following the retrieval of my 70-80s scalextrics from the darkest corner of the attic.

I have a few cars where the tyres have split, and some where the tyres have gone brick hard and they were covered in an oily substance!

Looking around there does not appear to be any service sheets for these particular cars (C441, c443 and c426) - how do I know what tyres to buy for them?

I was very surprised to see that tyres on their own are in many cases more expensive that tyres complete on wheels with axles... why is that?

Also, some wheels are very loose on their axles - should I glue them back on (superglue)? One wheel drive is somewhat limited!

Lastly - cleaning the (classic) track - I have been using a PCB cleaner from maplin, but its hard going. The track is not rusty, just badly tarnished. Should I use a metal polishing compount on a drill, if so what is recommended?

One thing that has survived well is a couple or SRS cars - boy, they can still shift....

Thanks in advance for the advice.

David