yamaha 60 trim motor/water intrusion

Hope someone can help me out on this one,my trim motor rusted out on top and water intruded into the fluid.Replaced the motor but need to flush the system of old fluid and replace with new.How do I remove contaminated fluid and replace with new?Any and all help would be greatly appreciated.

drain and refill several times

I’m now at www.teamcharlestonmarine.com

Thanks Chris,I was told that I probably would not be able to get all the contaiminated fluid out and to drain it from the fill plug.Do you agree or is there another plug to drain the system?I’m way to ready to get back on the water!