I had a light bulb go out on my Looney tunes atomic load car so pressed the plastic tabs on the atomic symbol and uncapped the bulb. The bulb is held upright by a core of black foam with the bulb socket stuck through a hole in it.
That foam has deteriorated to a thick gooey mess. The glue maybe? It hadn't reacted to or gotten stuck to the plastic yet, but I removed it from both containers with needle nose pliers.
I don't know if other Atomic load cars have their cores melting, but you may want to look at yours.
There is one chunk of it left here.
Here you can sort of see what a mess the bulb socket was. The too was so soft it wiped off with a citrus cleaner.
I think some card stock rectangles with folded down edges, to make squares, should give it legs enough to hold the square level and with a hole for the bulb, keep it off the plastic. Why wait to reflect? I'll do it now.