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About product and suppliers:
        Alibaba.com offers 160 wc cleaning block products. such as free samples. 

There are 159 wc cleaning block suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Turkey, and Spain, which supply 96%, 2%, and 1% of wc cleaning block respectively. 

Wc cleaning block products are most popular in North America, Domestic Market, and South America. 

You can ensure product safety by selecting from certified suppliers, including 90 with ISO9001, 15 with BSCI, and 14 with GMP certification.