A recent ad by Bing Lee had during its ad something like
You could create a Chinese laundry with that much [washing powder].
Mum, you can't say that!
Yes I can, I'm Chinese
Does "Chinese laundry" have any meaning other than a laundry staffed by Chinese people?
A onelook.com search only gives Wikipedia and Urban dictionary as matches for the phrase.
Wikipedia redirects "Chinese laundry" to Chinese Laundries in North America, which states that
In the United States and Canada in the late 19th and early 20th century, the occupation of laundry worker was heavily identified with Chinese Americans.
However, a google ngram search has "Chinese laundry" far more common than any other immigrant population (such as Jewish, Italian or Polish) plus "laundry". Does this mean "Chinese laundry" developed a non-literal meaning?
Urban dictionary has an entry about "Chinese laundry", but there's very few upvotes, and even the top voted entry has half as many downvotes.