In my industry (aviation), special 'high temperature' cable ties are available for use in engine nacelles and other areas that can get very hot. Although I don't think that there is a universal specification for what colour these are supposed to be, all the ones I have seen have been a very pale, translucent greenish colour.
I used some of these specification cable ties to install an auxiliary wiring harness on my motorcycle about 10 years ago, and they are still holding up very well - no evidence of degradation at all, regardless of location (exposed to sun or not).
I think that you might need to go to a specialty vendor such as Aviall to get them, though.
I think fellow forum member Quandary identified the key issue in his post above - if you purchase cable ties manufactured by a reputable company (for example, Panduit, although I am not suggesting that they are the only reputable company out there), you will probably get a far longer service life out of them than buying 'no-name' products.
Michael
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