Rear screen trim removal

[green A8]

Would it be correct to assume that removal of the main rear screen trim is the same straightforward job as removing the front windscreen trim?

The reason I'm asking is that I removed the front trim this morning from my project A8 and was shocked at the sheer quantity of very damp muck that lurked hidden from veiw. I wonder if this same trapped wet dirt could cause problems when it becomes frozen?

The A8 poject car, it used to look like this:



Second photo stolen from my pals 'phone I wasn't aware that he'd taken this snap



And how it looks today, after a couple of very gentle washes. Photo shows rear screen trim I'm asking about.