Step 5 · Clean the Mounting Surface
After removing the old faucet, the tub deck will likely have residue from old plumber's putty or sealant. Use a plastic putty knife to gently scrape away all of this old material. Be careful not to scratch the surface of the tub deck. Once the bulk of the material is removed, use a rag with an all-purpose cleaner or mineral spirits to wipe the surface completely clean. A clean, smooth surface is essential for creating a watertight seal with the new faucet.