Thanks, yes there are two sides to this question, one is how to best preserve the rubber and the other is how to make it look new and shiny again. Of course it is easy to buy some product off the shelf and shine them, but is it any good for the rubber in the long term? There are other issues too, for example if the product leaves a sticky surface then dirt, dust, and leaves are more likely to stick to the wheels.

I am sure other members who have done restorations will know the answer.