How to clean the torch ICPOES5800?

Hi everyone,

after two measurements of gasoline samples, the torch was not clean. I soaked it in aqua regia for 4 hours, as in the user manual. It dit not work. Could you please give me some suggestions? What can I do to clean it?

Thank you very much!

Best regards,

Sophia

 torch after 4 hours in aqua regia

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