Actually, I think you're simply giving humans too much credit.
Most humans DON'T clean up their homes if they are actually abandoning them (as opposed to selling or passing them on).
They leave them in horrendous states of disorder, full of trash and rotting food, and worse.
The only reason humans clean up their home before they leave is so that the next person to get it will be pleased with it, and will think highly of them. This only applies if they're selling or giving it away. So, it's a social thing. (A clean home also attracts buyers, so that's value, there).
Truly abandoned homes are rarely left totally cleared out, let alone actually clean. People take only what they want with them, and leave the rest.
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