The word clean doesn’t mean the same thing to everyone. During our current pandemic clean has taken on a whole new meaning. REALTORS do not agree on the meaning of clean.
At the very least belongings should be removed from the home and the floors swept for the new owners. The refrigerator, stove, and microwave should be cleaned inside and out. Toilets, tubs, sinks, and showers should be cleaned too.
We often assume that because someone owns a home that they know how to clean it. I haven’t found that to be true.
Sometimes the sellers say they cleaned the house and the buyer says they didn’t and they are both right.
Buyers can ask for a specific level of cleaning in the purchase agreement. They can ask to have carpets shampooed and can ask to have a professional cleaning service to perform a “move out cleaning”.
That doesn’t mean that the house will be clean enough. Your best bet is to ask to have it cleaned and then plan on having the home professionally cleaned before you move in or plan on cleaning it yourself.
I have never moved into a house or apartment without cleaning it first.
If I were to sell my home I would clean it or have it cleaned. I know from experience that if a home is clean buyers are less likely to want to go to court if there is a problem with the house shortly have they move in.