You can put them in frige and clean them the next day. Have done this many times. I use an electric Rapla Filleting Knife works great. When blades wear out replacement blade is around $12.00.
Trust this helps you and saves the cost of 50 cents a perch. I also believe when you fillet your own fish, you donot need to worry about bones in the fillet.
Tight Lines[}🙂]8D