I need some advice on how to properly 'pre-rinse' and then clean out my Graco 490 sprayer depending on what material you want to spray. Recently I've learned that to clean out whatever liquid you've got in there for longer term storage, first you need clean it out by running something through it that's similar to what you'll be spraying. For example if antifreeze is in it you'd want to run lacquer thinner through before spraying a lacquer finish. When you're finished spraying you'd then run lacquer thinner through again to clean out, and then maybe run some mineral spirits through to clean the lacquer thinner out. Does this sound about the right pre-rinse and cleaning procedure for spraying lacquer? Also I need advice on how to pre-rinse and clean the machine when spraying an oil based polyurethane. Latex would be simple. I assume to rinse with water first and then clean afterward with soapy water.