Thanks for your input, Thomas. After my first Alclad session I cleaned my Triplex with Isopropyl Alcohol and it worked well. Think I'll stick with it cause I can get it for free.
Now what happend over the last weeks? I want to show a late war plane with unprimered inner surfaces, so I gave the wheel bays a coat of Alclad aluminium. Used Gunze black primer as base coat but should have thinned it a bit more. Came out quite rough and so the Alclad looks grainy, too. But for a dirty wheel well it's ok I think.
Fuselage is closed by now. I cut off the scissor link on the front gear strut (not there on late 262's) and cut the whole strut in two. So I can glue the upper part in place before closing the fuselage like it's stated in the instructions by avoiding snapping off the whole thing during future handling. Luckily there was a sinkhole in the center of the strut, so I can later put a piece of wire in it to allow a stable connection.
The cockpit is nearly finished, only the yellow emergency release lever for the canopy is to be added and the Revi, of course.