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Janitors at some of Silicon Valley's marquee technology and biotechnology companies will go out on strike today, having dismissed a contract offer from cleaning companies that employ them as "insulting." The union that represents the workers, Service Employees International Union Local 1877, said late Monday that janitors will walk off the job at Cisco Systems, Apple, Hewlett-Packard, Oracle and other high-tech and biotechnology corporations throughout Silicon Valley and other Bay Area commercial buildings it did not identify. The SEIU said it had the support of other unions, including Teamsters and construction workers, who pledge not to cross picket lines.