Bomag

I have a 2015 Fit. One morning last year, the front driver side floor had an inch of standing water in it and white fuzzy mold on the carpet all the way under the seat which was dry. There was no sign of water having dripped through anywhere visible in the compartment. I mopped it out and took it to the dealer. After puzzling for most of the day, the tech suggested it was debris clogging the roof drain where it went into the engine compartment, diverting the flow to the front cabin wall. He "cleaned out the channel". This year, the same thing happened. Same white moldy covering to the carpet. I removed the visible debris at the upper corner under the hood but couldn't reach the channel above the opening. I need a fix for this! I live in Seattle and the car sits in the driveway. If the car gets moldy permanently, my perfect little car is useless for both me and resale. Apparently, insurance specifically excludes mold damage.