We all know the secret to good fish is fresh peanut oil, but it's $20 a gallon now. I use the filter shown below, and don't let my oil get too hot, but I still only get a few uses before the fish start to come out greasy. Does the potato hack really work? Are there any other tricks to make the oil last longer? I hate spending a fortune on peanut oil, but I hate greasy fish even more.