Ive used easy off oven cleaner along with a scraper and it worked great, But there's some good "more expensive" engine degreasers out there,
Check with your local parts store

You could also use a pressure washer but it makes a horrible mess of everything around it... ohwell

Some people are like Slinkies, Their not really good for nothing... But they still bring a smile to your face when you push them down the stairs.

1951 3100 350 TBI Gallery Toddzilla... "$old"