Sale! Everything must clear!

Yes, everyone has seen a sign or two like this somewhere haven't you?


According to my observations, during clearance sales, the phrases 'everything must clear' or 'everything must go' are often used. Once again, I ran a search with the phrase 'everything must clear' and this was the first page which came out.


After going through the first 5 pages of the search results, I noticed something. The search results included the phrase 'everything must go' as well. Interestingly, though, the sites which used the phrase 'everything must go' were mostly by foreign sites like those from the UK. In contrast, the phrase 'everything must clear' generally came from local sites.


So would it be safe to conclude that 'everything must clear' is a kind of a local phrase? The meaning is pretty easy to get; it simply means everything has to be cleared from the store. But the usage of the word clear differs. Not that the sense of the word doesn't exist in standard English.

clear
1 surface/place
[transitive] to make somewhere emptier or tidier by removing things from it


But it might be generally considered weird by other speakers of English for clear to be used in this situation. I guess this is the image Singaporeans have in mind when they wish to indicate that the store needs to be emptied.. literally?