How to Remove The Flow Restrictor From a Bathroom Faucet Apply pressure to the faucet head using the wrench; you need to keep a tight grip on it. Unscrew the flow restrictor from the faucet by twisting the wrench counter-clockwise (lefty loosey). After it comes off, you need to inspect it closely. If it has mineral build-up, you need to clean it with hot water and a brush.