Step 5 · Clean the Drain Threads and Surface

After successfully removing the old flange, it is crucial to prepare the surface for the new installation. Use a plastic putty knife to scrape away the bulk of the old, hardened plumber's putty from the bathtub surface around the drain opening. Use a wire brush to thoroughly clean the female threads inside the drain pipe (the drain shoe), removing any bits of old putty, sealant, or corrosion. Be meticulous with this step to ensure the new flange will seal properly. Finally, wipe the entire area—both the tub surface and the pipe threads—with a clean rag. For a perfectly clean surface, you can wipe it down with a rag dampened with mineral spirits or rubbing alcohol to remove any final oily residue.

Tools and Materials

Putty knifeLincoln Electric 9 in. Long Wooden Handled Brass Welding Wire Brush (.4 in. x 2.6 in. Bristle Area 2 x 9 Row) for Cleaning Aluminum KH583THE CLEAN STORE Microfiber Pink/White Cleaning Cloths (Pack of 100) 79136Klean-Strip 1 qt. Odorless Mineral Spirits QKSP94005