I saw this tutorial but i just cant seem to replicate it https://www.youtube.com/watch?v=1RQtEzbY7ig
i used a different rain texture from poliigon, a displacement map which i plugged to roughness.
cant seem to make it work
What results are you getting? What specifically isn’t working? Some screenshots of what you have so far would be helpful 
so he got the streaks on the window. i get nothing. the window turns to something like frosted glass
Please add a screenshot showing what you have
Or better yet the blend-file.
Things like “streaks on glass” might also be a good candidate for compositing. Get the basic shot done the way you like it, then focus (only …) on “the streaks” and composite them in. That way you’re not “re-rendering” the whole thing – only the streaks until you get them just right.
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