you want the hard way? or the harder way? :oD
- you can change the oil and filters a couple times till it gets purged and clears up
- you can change the oil and filters, pull the lines and drain them, pull the cylinders and drain them
one way is sort of expensive, the other is VERY expensive due to pulling the system apart. Take your pick ;o)

personally i would choose the easier less expensive way and just change the oil and filters a couple of times.