How can I open the creaking door

Hint 1 of 13:

You must get though the door.

Hint 2 of 13:

You need to do something about that noise.

Hint 3 of 13:

How do you stop squeaking?

Hint 4 of 13:

You'll need grease.

Hint 5 of 13:

There's some in the bottom of the ship.

Hint 6 of 13:

You'll need the keys to get through that grate, though.

Hint 7 of 13:

Have you gotten keys from LeChuck's cabin?