Compression

So last night I started taking apart my motor.

1.The head gasket was blown in two places,between cylinder 5&6 and also between cylinder 6 and the area for the pushrods.

2. I also think the valve stem seals need replacement.

3. Cylinder 6 seems to be the one with the bad rings....it has alot of oil on the cylinder wall. All the others seem normal.

What's the the best way to get crud off the valves and other parts?