I just bought new pads and rotors and am changing the rotors for the first time (yeah, I know...first time??!!)...

...what do you guys use to clean the rotors prior to install?

and what is the size of that Torx (or Allen) bolt that holds the front calipers in place (93 W124 M104)?

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car