(Arlington, WA)  --  A clean-tech business based in Arlington, Washington is apparently unable to pay its bills.  The Everett "Herald" reports MicroGreen Polymers is being foreclosed on by one of its largest investors, Confederated Tribes of the Grand Ronde in Oregon.  MicroGreen closed its doors Friday, and company officials haven't commented, though a spokesperson for the tribes said it had not been able to meet its financial obligations.  In 2013, the tribes reportedly invested 18-million dollars in the company, which was known for its plastic cups made from recycled materials.