Lithium contamination (7850)

We unfortunately  analyzed a client sample with 100000ppb Lithium and we can't seem to rinse it out of 7850.  Any suggestions?  We have cleaned the cones, lens, all tubing, new torch.  Our matrix is 2%nitric.  Is there anything else we can do? It is slowly washing out however its been several days and we would like to move this along.

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