Perhaps the problem is not with the Renault Fluence door itself, but with its castle. There's dust in the lock on the door, and the creak comes in. To solve the problem, it is recommended to lubricate the castle with silicone grease.
You can also try to lubricate silicon door sealants, sometimes they squeal. As an option, we need to check the spray. Sometimes it looks like a door creaks, but it's actually creaking a splash-spatter. In this case, you just need to fix it.
