With a cartridge pen, you may have to let it sit overnight unless you have an empty cartridge to hold some of the soapy stuff. A syringe works great for this. In any case, rinse well afterwards.
This process washes out the chemicals used to release the pen parts from the mold during manufacture, which can prevent smooth ink flow. Kinda like washing a new garment to remove the 'sizing' chemicals before wearing it.
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