Someone put transmission fluid in Inverter tank!

I had to have the electric water pump changed recently and discovered that the previous owner or his mechanic put transmission fluid in the inverter tank. What is the best way to make sure we get it all and possibly save the inverter? I'm assuming we do a flush (or several). Maybe change the inverter coolant hoses as well?

 

Thanks for the reply. Is there a flushing procedure or do I just drain, fill, bleed, repeat?

 

I flushed multiple times, alternating between a mix of water/cascade and just water then several final flushes with water only and the last flush distilled water only. Finally I refilled and bled with Toyota coolant mixed with distilled water, then did the exhausting bleed process. Drove for a few miles and let it sit and found a skim coat of foam (Trans oil/coolant mix) at top of coolant tank. I'm done for today, I'll start the whole process again tomorrow and I think I can get rid of the foam. Once I have it good and clean I will replace the hoses and refill the system and hope there are no long term problems with the inverter.

What's amazing to me is that the inverter cooling system was approximately 80% transmission oil 20% coolant. The coolant being what we added last week when changing the electric coolant pump. It was actually driven about 1000 miles with 100% transmission fluid in the inverter cooling system with a bad coolant pump and did not overheat.