What dirties solar panels in Seffner
I-4 diesel soot
Freight traffic on I-4 and US 92 lays down a carbon film that is oily rather than dusty. It resists plain water and needs a proper pure-water wash to release.
Agricultural dust from the east
Field dust from Plant City and Dover carries west into Seffner regularly during dry season.
Unpaved driveway and road dust
Many Seffner properties still have limerock drives, and that dust ends up on the roof every dry windy day.
Pollen and canopy litter
Established oaks on older Seffner lots add the usual seasonal organic load.