In this video

After the carpet and pad are removed, you may find adhesive or backing residue stuck to the subfloor, as seen at the start of the video. Use a floor scraper or a sturdy hand scraper to chip away and remove these remnants. Apply firm, consistent pressure, working in small sections. For very stubborn areas, a chemical adhesive remover (check compatibility with your subfloor material) or a heat gun might be necessary, but exercise caution and ensure proper ventilation if using chemicals or heat.