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It's pretty straightforward if there are 2 of you, one person holds the cat and then all the person applying has to do its make a parting in the hair at the scruff so you have a straight line of skin a couple of cm's long exposed then apply the treatment directly to the skin. You're going to get alot on the fur no matter what you do but make a few different partings around the scruff so you can apply as much directly to the skin as possible.
Any videos of how to put anti flea stuff on the scruff of the neck.