Could use some help, I want to clean evaporator coil.
Can I reach through center vents?
I dropped the ducts under dash and removed carpets, I feel fins through flap opening on both driver and passenger side.

I read WHunter link about scrubbing bubbles, so I went to Home Depot and go to cans and a few feet of 3/8 tubing and shot both sides full.

Removed drain on passenger side and shot some up through there but No Drainage of any kind
Took garden hose with small stream and feed in same opening but again No Drainage unless I shoot through drain then I get some.

What Am I doing wrong?

Thanks in advance
greazer2b