Cleaning kit is to help remove stain on print head.
Do soak print head in cleaning solution to remove the dirt from paper or dust. If your print head is on the cartridge, soak print head in cleaning solvent with a container (Do not let the chip touch the solvent)
For clog that is serious do clean multiple times to clear the clog.
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If the stain is serious and left over long period of time, try putting it overnight and cleaning again the next day.
Alternative methods if you are unable to remove the clog pump Nippon-ink cleaning solution into cartridge to remove the dirt through software cleaning from the respective printer manufacturers.
Note: If the print head have fused (solidify) with the dirt and is very stubborn, this may not be able to remove however it removes most of the dirt thus you may still have missing lines from the inkjet test print but there will be improvements after the cleaning process.