Hi Wharfe, Swimmers putty is my weapon of choice when i'm doing long distance motorway miles- they work a treat for me but everyone's different.
https://www.amazon.co.uk/Zoggs-Silicone-...B001C3AJNM
https://www.amazon.co.uk/Zoggs-Silicone-...B001C3AJNM
Treat everything in life the way a dog would- if you can't eat it or foc it, forget it.