Remove the Old Faucet
Using a basin wrench, reach up behind the faucet, and unscrew the coupling nuts connecting the supply tubes to the faucet (figure 1).
Use the basin wrench to remove the mounting nuts holding the faucet in place (figure 2).
With the mounting nuts disconnected, lift out the old faucet, and use an adjustable wrench to disconnect the sprayer hose from the assembly (figure 3).
Lift out the sprayer hose. After the faucet is removed, use a scouring pad to clean the sink surface thoroughly. If the sprayer-hose escutcheon cap is in good shape, you may want to leave it on. If not, replace it with the one included with the new faucet.