OK, so for the past year I've battled with this darned metal bracket that the rain sensor clips to. For whatever reason I can't get it to stay attached to the windshield.
I've tried in order: two types of double stick tape, crazy glue, RTV glue, two different epoxy's, and lastly rear view mirror adhesive.

After a short time the bracket comes off the windshield and just hangs there. I scrape everything off the bracket and windshield. Clean it with alchohol. Rinse and repeat.

I can't prove it, but I swear last week when I got in the car, and noticed it hanging there is was laughing at me saying "try again sucker".

Granted the hot sun doesn't help, but still it's not like these things are falling off all over the place in hot weather.

Is there some special adhesive I should be trying that I'm just not thinking of? Also, I'm not talking about the clear rubber part (that they call tape for some odd reason). It's the bracket itself as below.

 

I would call a local long-time-in-business, well-respected indie automotive glass shop and ask them what adhesive they would recommend. And if they quoted me a fair price, I would probably let them do the job so I could avoid having to repeat this fix again and again.

 

Thanks RX. That's great suggestion actually.
The whole thing seems like it should be so simple that I've just been hell bent on DIY'ing it. Never really gave much thought to a glass shop. I could only think "dealer", and I'm not much impressed with the service dept of my local Lexus dealer so that was not an option. I'll find a glass shop and make some calls. I can't imagine much of a cost

 

Lets us know what the glass co uses. In reading the lexus manual, it talks about the using rain sensor tape (double sided sticky gel tape) - which is trimmed to fit viewing window of sensor - which is the same size as the inside rectangle shape of the sensor metal mounting bracket. It doesn't mention how the metal bracket is fastened/bonded to window glass.

 

Yes, if I get to know what they use I'll defintely pass it along. I have no idea who decided to name that gel "tape", but regardless, from what I know it's more to help the sensor detect the rain.
I replaced the gel months ago just for the fun of it Figured I have this thing on and off enough I might as well