The harness is really useful but at first you and the cat have to go trought a process of get the cat used to using it, The first day you put it on him, the cat won't even want to move, that day you just put the harness on it and leave him alone until it starts to move by itself.
The first day you two wont even leave the house hahaha, it is a process....
How often do you bathe your cat?
I do it once a month because he go outside and can get dirty and because he sleeps in the beed with me.
and how often do you do it?
i know the format of the post was a little messy when you saw it but i already edited and fixed it, everything is correct now.