Clean it properly then use gorilla tape.
Thank you. My google-fu was only giving me horrible "wires ziptied to the mudguard stays" type answers. I knew there had to be a better answer.
I've had the Gorilla tape method on my Isen with guards for a good 10,000km and it has worked great with no need to retape.
@Aroogah started
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Clean it properly then use gorilla tape.