For short term use you can buy "low tack tape" which as the name suggests isn't very sticky so it comes off without leaving residue. It's often used while servicing business jets to make sure none of the expensive woodwork inside gets scratched. The downside is that it isn't very durable - intended for single use, and would probably wear through on a bike after a little while. The only other option is clear Fablon (sticky backed plastic film). This is thicker and stickier but of course looks bad when it starts to wear and get dirt embedded. But at least it'll protect your plastics.
Honestly though, if you're going to be doing high mileages through all sorts of terrain you'll get wear and tear on the bike anyway, may as well accept it.
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