No matter how advanced your car is, a smelly air conditioner is inevitable thanks to how mold and mildew grow. As long as there is heat and moisture, those two organisms will flourish.
For this reason, many have relied on Klima Cleaner Pro to rectify the issue. We don't have the method for treating every model and make of vehicle on the market, so we rely on our customers to post their methods for accessing the evaporator of their vehicle. The evaporator is the heart of the air conditioner system and where the source of the odor lies.
In the case of the Model 3, we discovered this excellent post by user pmagid on how to remove the cabin air filters which then gives one access to the evaporator where Klima Cleaner Pro can be applied.
Check out the detailed post at https://forums.tesla.com/forum/forums/stinky-feet-smell-solved
If you have a method to share with the community, please let us know and we'll post it with much appreciation.