Tire cleaner.
It also can be used on the whole bike, it will make it look brand new.
We did it in a shop I worked at when selling used bikes.
For some you could hardly tell it was used, but then again the guy who cleaned the bike cleans his twice a month, taking it fully apart (a bit Bike OCD)
<img src= "https://www.carpages.co.uk/news/news-images/tyre_cleaner_14_07_05.jpg" >