I was in Asia last month on business and managed to check out shops in Korea, China and Japan. I could not find anything decent in Korea (Seoul, Pusan) or China (Beijing, Shanghai and Shenyang) but did manage to visit Superautobacs in Tokyo. They sell extensive Sonax, limited Griots and Meguiars and of course the major Japanese brands. Sonax, Griots and Meguiars were on endcaps so I didn't want to draw attention and take pics (discouraged if not forbidden) but I did manage to get some candid shots of the detailing row with Japanese branded products.

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