ion source and column

Hello friends, I have two questions and I hope you can help me.

1. Is there a specific parameter that indicates that the ion source should be cleaned?
in the manuals it is indicated that when the GF has increased from two to three times the value of the clean source, it is necessary to consider cleaning it.

2. Regarding the column cleaning treatment, have you obtained good results washing it with solvents?
I know that this procedure must be carried out with the column disconnected from the equipment and I want to know if I have any hope of recovering some columns.

Thank you

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