The reality is that you can't know the actual dirtiness until you check it for yourself.
I understand that there may be cases that are a bit difficult to understand, so I would appreciate it if you could send me a photo. By looking at the photo, I can better grasp the specific situation.
I hope you understand that people have different perceptions about the "dirt" on shoes. Some people might be bothered by even a little bit of dirt, while others might not mind even after long-term use.
The only certain thing is that shoes are made from the same materials as clothing. While it's common to wash clothing after wearing it once, it's not uncommon to use shoes for a year without washing them.
Therefore, just as it's difficult to remove the dirt from clothes worn every day for a year, it becomes challenging to remove dirt that has accumulated on shoes. The key is to remove the dirt as soon as possible.
For example, a day's worth of dirt can often be removed by simply rubbing it gently, but it takes a lot more effort to remove a year's worth of dirt. By taking care of your shoes early, you can keep them cleaner.