Hello , Here to answer automotive questions and make you feel comfortable and become familiar with your product.
you may have clogged rear sunroof drains as well as front ones.
I will supply a link with photos explaining how to remedy the situation
I've seen steps to address this problem without removing the bumper - in your opinion is this possible?
For "no bumper removal", I assume it would be the same process (as the front) working downward with "routing tool" - but no visual confirmation you made it all the way through???
Realize this is sub-optimal but it might be my best option as a city guy with no tools and no work space.