The top of the bottle has a plastic film seal but that didn't prevent some of the contents to leak out during transport. Luckily it wasn't enough to damage the rest of the items but I still think I should warn people against this product. At least for long distance shipping.
The cleaner worked fine but it didn't smell very nice. It has a rather sharp, unpleasant chemical smell. It is by far the most foul smelling guitar polish I've ever used. For this reason I probably won't be using this product much, although it works great.
I'll have to give it a two star rating, although to be fair it works fine. I don't quite understand the point of a "protection" rating though. No cleaner/polish will give your guitar any meaningful "protection" and I think Thomann should reconsider the use of this rating. Maybe there's a slightly different meaning that got lost in translation from German? It wouldn't be fair to give a poor rating as no other cleaning product will give you any better protection so I'm giving five stars here, although it will of course offer no protection whatsoever.