thank you for your opinion, it is your right, but it would be better not to misinform others
The fact that is clearer than the opinion is that within 20 days specifically for this car you have two other feedback where they state that everything is fine, without any problems
You say that the car is in bad condition, but it didn't give you any problems during the whole trip.....
As for the opinion that the car was dirty, you had no reason to sign in the contract that you will return it clean on the last day and it would not be necessary for you to ask what the car wash costs at the airport , one day before delivery
we wish you all the best!