My screens need changing only every couple of months with at least 8 bowls of use per day. My routine is the following: I finish the load, I tamp it out, I give a good blow from the mouth end to the pipe, then a good blow in the bowl. I brush the inside of the bowl a little with a MFLB brush and blow a couple more times in the bowl and the mouth end and then take a hard draw with my tongue close to the hole so bits and pieces get sucked and stick to the edge of my tongue. I either swallow or clean my tongue with my fingers and that's it. When the walls of the bowl begin to gum up I put a couple of ISO drops on a cotton swab and brush the inside of the bowl and it's like new again. Once or twice a week I will soak the pipe with the screen removed in some ISO and pass a pipe cleaner through it. A hot water rinsing and some soaping if you feel like it and the pipe is like brand new again! Simple and fast. If you take a little care when removing them (I use a dentist's tool or a bent paper clip that I insert from the screw hole and push the screen up), the new screens last quite a while!!