Replacing worn Shimano STI lever hoods is a quick two minute task that can really refresh the front end contact points on a bike. Leaving the bike in the sun (or warming up the hoods with a hair dryer) and using an evaporative hand sanitiser to slip the new hoods on makes this a straightforward simple task!
Shimano STI Lever Hoods (Amazon US): https://amzn.to/324mvei
Shimano STI Lever Hoods (BikeBug AU): https://bit.ly/3jTE6vJ
Hand Sanitiser (Amazon US): https://amzn.to/336D34P
Isopropyl Alcohol Spray (Amazon US): https://amzn.to/2ZhrkPN