Do you guys flush your engines?.

[mushman]

I leave my boat in its slip all season, and I have an older engine without a quick connect so I never flush it out, but I've seen what salt water did to my thermostats when I removed them so I know it would be a good idea to do it.
Is there any way to flush an older Evinrude while it sits in the water?.
Have any of you tried muffs while in the water?.I've never seen anyone do this, but I guess it could be done.