The water may not have come from the broken light cover. the high pressure water probably enter between the liftgate and frame seal.
There is a rubber seal on the frame that seals the liftgate when close. with the liftgate close, Take a water hose and pour water on the enter liftgate and 3rd brake light assembly,... wait til it drain off.... open the lift gate and the seal should keep the water out.
Just break down and buy the 3rd brake light assembly. Be sure to re-install the black rubber gasket with the new 3rd brake light assembly.
If you are repairing the light cover, DO NOT USE SUPER GLUE!
Use clear two-part epoxy. let dry overnight
I only pressure wash my wheels and tire when I go mudding, and hand wash the body.
2008 Sport Liberty
Cold air intake*Trush (magnaflow) turbo muffler* Hypertech power program*
Hood Prop mod. Battery Quick Release mod.
Resonator removed (sounds like a V8 on start up)