Heading to Warsaw from the US in a few weeks and I just learned that I will need to be meeting ready when I am picked up from the airport in Warsaw. I fly United from ORD to MUC overnight and have a 90-min connection before continuing to WAW on Lufthansa.

Flying in E+ as a United 1K, what are my options to clean up at one of the lounges before my next flight?

I usually don't go through Munich and am unsure of the typical procedure and time for clearing customs etc. Do I need to grab bags and re-drop? Is there a shower-equiped lounge close by?