Here's my fix--worked for me and saved having to disassemble anything!--
I started by carefully pouring gentle enzymatic drain cleaner into gutter (this is the stuff you put in drains overnight to slowly soften and dissolve organic matter--it's more soap than solvent).

Then, I had good luck feeding ...

Don't know if this would work with XC90, but I had good luck feeding a 1/8" clothesline (vinyl-coated multi-strand steel cable--got mine at Home Depot by the foot) directly from the gutter area on my V50. You can find the inlet heading out at a 45-degree angle from each of the front corners of the ...