When 'cleaning out' a space, it implies removing items until the space is entirely empty.

Full Removal

'Clean out' suggests more than just tidying; it involves thorough clearing.

Not Just Cleaning

When related to finances, 'clean out' indicates spending or losing a substantial amount of money.

It conveys the exhausting of resources, not regular spending.

Implying a situation where thieves take everything, leaving nothing behind.

The phrase suggests illegal or unethical removal of items.

In abstract usage, 'clean out' can mean removing bad aspects from a situation or group.

It is often used metaphorically to refer to making substantial improvements.