From Austria, but Germany has quite similar laws.
You'll get 96% Ethanol with bitterants (so that you do not trink it) in every bigger supermarket as well as hardware stores, it's either called Ethanol or Brennspirtus.
For non-denaturized Ethanol you have to go to the pharmacy. Expect higher prices as every (theorethically) drinkable alcohol is subject to a tax.
At least on Android you have NewPipe, which is an easy to install alternative Frontend for YouTube, or YouTube ReVanced, which applies multiple Patches to the original YouTube-App in order to make it more useable, however sometime the patching process causes trouble.
I'm currently using Revanced and it still works like a charm and completly adfree.