How to protect bike frame mounted on the carrying rack? The ropes I fix the bike with on the rack and the rack itself (although covered with a plastic layer (an old inner tube) make marks on the frame. I would like to avoid using extra pads, sponges or foams that always gather dust and dirt or fall off the correct place. Is there any special trusty method?
Pool noodles, cut lengthwise and held in place with gaffer tape (or hockey tape if you're so-inclined)

Bonus marks for colour-coordinating with your bike and car.   Do the whole length of the rack upstand, not just the contact point.



Like this but on the upstand too, not just the tines.



You could put the protection on the bike, like this, but its more likely to fall off.  Velcro cable ties can help here.