Blown-in insulation typically lasts 20 to 30 years, but fiberglass and rockwool can last up to 50 years, though effectiveness may decrease over time.
To remove wet spray foam from your hands, apply acetone or nail polish remover to a cloth and rub gently. Wash with warm water and soap, then apply a moisturizer.
Use serrated blades or putty knives to gently remove foam insulation, and for tougher areas, use a power drill or grinder.