Does anyone know any good remedies for really sore muscles from an extreme workout?

Vicks. Vicks vapor rub, icy hot, bengay, tiger baum are some otc products that could help. Also the best home remedy is ice and cold compresses. Hydrate yourself, and I hope this helps!
Ice. Ice is great for decreasing pain and swelling acutely. Immerse an extremity in an icebath, rub the affected area with ice, or place a frozen bag of corn or gel pack on the area for 15-20 min every couple hours the first day or two.
Ice. Usually ice on the affected area along with some NSAID meds are helpful that is why I recommend a routine of hard/ easy workouts to allow muscles to recover from a difficulty workout and avoid future injuries.