Just wanted to clarify a little on this. So, being familiar with this part, just want to state that replacing will likely not “fix” the issue as the new one will do the same thing. Maybe not right away, but eventually. There is a sticky, slimy, jelly glob that gets smashed between the glass and the rain sensor. It’s purpose is to optically bond the rain sensor to the windshield, so it can “see” water droplets. The part is held in with clips, with the gel literally smashed between itself and the glass. Calling it a leak is kinda not accurate. It’s more like the gel kinda seeps some liquid out of itself- it’s already slimy, and that wetness (it’s not much really) will eventually settle enough over time until it forms a drop and drips off and down the glass. It’s not a defect and will not cause a problem, besides the occasional smear on the glass to be cleaned. Eventually it will not do it anymore, but replacing it will start it over again, so to speak.
Hi Mike,See, that’s the thing. It’s not really losing anything, besides some surface “wetness”. As long as there’s no air bubbles, it’s good to go. I’m trying to think of something similar to help describe the material, but I’m struggling with that. Manufacturers used to use a physically bonded prism to perform the same function. Those were non removable, but made out of a hard material like plastic or glass. The newer versions are replaceable, but that requires a different method to transmit light between the parts without obstruction (like air bubbles). That method is the transparent gel pad. Here check this out. Maybe it will help describe the gel some. You can see in this video when he tests if it’s cured how it’s kinda slimy, and again when he sticks it to the glass. The surface is slightly moist, and that moisture collects over time into a drop.
Thanks for posting that informative tech about the rain sensor gel.
Hopefully your replies will help others who reference back on this and similar threads to help them understand that it's really a non-issue, is a normal characteristic, and as mentioned, replacing it isn't going to "fix" anything that really isn't "broke".