MEK works great, but is
highly toxic.
Transfer a small amount to an old liquid glue bottle to limit your exposure to the fumes while working with the glue. Make your transfer outside where a spill will not hurt anything.
MAKE SURE bottle and can lids are on tight. Store the large container in a vented (and secure from kids) location. Keep the lid on the bottle when not in actual use.
If MEK spills or leaks, it will destroy most plastics.
Apply it with an OLD, small paint brush with a wood handle. It will "wick" into building junctions, but will "craze and frost" clear plastic windows. It melts the plastic to form a welded bond.
For glueing down figures and vehicles, I use Allene's craft glue. It dries clear and is flexible. If I bump a figure slightly, it does not break loose. It dries very slowly, like white glue, but can be spread with your finger for scenery. It is water clean up and can be thinned with water if desired.
This is probably more information than you wanted, but other people may be be interested. If not, my apologies!