I'm going to disagree here. I've repaired a lot of ABS plastic parts on old cars using various methods, and purpose made ABS solvent cement is far and away the best and strongest solution. The ABS cements are a cocktail of solvents (usually including both acetone and MEK among other things) and dissolved plastic that does an excellent job adhering to parts and allowing the solvents to bond everything together without evaporating too quickly or deforming the parts or damaging surface finishes like you would trying to use only acetone. If you find the residue ugly then just file or sand it off, but it never bothered me being on the back side of interior panels.
I got rid of the metal clips and only use butyl rubber to hold the triangle pieces onto the door cards but left the clips on the knee bolster. It works well for the door pieces as it's very easy to remove when I need to but stays on perfectly otherwise and doesn't harden with age. For removing the knee bolster I seem to recall reaching up under the dash and pushing on the clips from behind with something to help release them without breaking tabs but maybe I'm mistaken.