Pretty much the same-interior windows-try a Lamborghini Diablo, you have to be a midget (oh, excuse me, a little person
) contortionist to clean them.
Wheels, especially the hideous snowflake/diamond designs, like the 740i, Lincoln Town Car and the absolute worst, the Infiniti J30 rims. Not only do they have that stupid diamond design, the coating is absolute crap and once brake dust begins to build up, it runs the coating and they are impossible to clean properly without removing, blast beading and recoating.
Slightly behind is cleaning the front end of trucks with those huge brush guards that are so close to the grill you cannot get your hand or even a thin brush between the guard and grill.
I used to hate compounding out faded paint, but when I see how good it looks when I am done, it makes it worth it--unless the person waits until it fades again to call me back.