There is an airside bus from T2 to T1 which you could take to transfer. If you are lucky enough to stay airside upon arrival the bus stop can be found downstairs from the G level. However if you are arriving from outside Schengen, you will end up outside security after passport control. Once you are landside, you cannot enter T1 airside without a valid departure boarding pass. That means you won't be able to enter the PP lounge.

Instead head for the public showers available from MUC airport:
http://www.munich-airport.de/en/cons...=visit_1190524