Incorrect return instructions

Good vehicle, satisfactory service

I picked up the car at 8 AM. There weren't many people, and most counters were open. Filled out a few forms and had a $1000 pre-authorization, then took the car and left.

I had read some not-so-great reviews about this place on Google Maps, so I was a bit worried. But when I went there, there was no queue, and the staff was quite friendly. However, their strong German-accented English made communication slightly challenging. The process of providing an international driving permit, license, credit card, and passport was straightforward. Overall, my experience was very good.

After returning the car, I was charged an 86-euro cleaning fee. It might be because of the muddy rain. However, this is the first time I've encountered such a situation after renting cars multiple times. It feels like being ripped off, and despite sending an email requesting an explanation, there's been no response for a week.