Road Vehicles Tyres

HI
Thanks for the help.
IPA (rubbing alcohol) worked great and now goes up the slope, even at big angles.

Ripley
Slot cars sound good, but all there tyres are smooth, well at least the ones I have) and this wont help get up the slope as they will slip.

Leyland
The road plates are smooth, but the ramps have thick marks on both sides so the tyres have something to grip onto and go up. True the tyres done have alot of grip, but due to the track they don't need much, just enough to get up

Thanks again for everyones help.
AOF04