When we moved into our house (75 yr old house), we noticed that the hot water side of the kitchen faucet runs slow. All the other other sinks and showers in the house are fine. Hubby recently replaced the supply line from the sink cut-off to the faucet in the kitchen. When he took out both of the old ones, he noticed a lot of build-up in the lines. is there a way to clear the rest of the hot water line to the kitchen without replacing it?