To safely remove rubber underlay residue from timber floors, gently scrape loose bits with a plastic putty knife. For stubborn spots, use a timber-safe citrus-based remover such as Goo Gone for 2–3 minutes. Then wipe with a microfiber cloth, and neutralize with a pH-neutral wood cleaner. Always test first, ensure ventilation, and wear gloves. A 100 sq ft room typically takes 1–2 hours to clean.With over 15 years...