Since I have my intake off I wanted to clean it up - the outside is easy but inside there's lots of oil. Should I clean it or just let it ride? If cleaning it, what's the best method to get it all out? Because we'd be talking at least 20 cans of brake cleaner (and I hate huffing that stuff). De-greaser doesn't have any effect unless it's brushed, and getting a brush all up in there is near impossible.