Are the rear 1/4 panels sealed hollow units or can you somehow access the inside? The reason I ask is that I have a small hole opened up above the bumper clip so I’ve bust it off and the great design it is it was all wet, I’ve opened up and cleaned and treated with bilthamber - this thing is smaller than a 5p but the interesting thing is that there appears to be something like synthetic hair packed on the inside coming out the hole? Is the normal or has this somehow got in?

Cheers Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF