Yes I do!!
Every spring I remove the battery and tray.
Don't forget to plug in Donald's El Cheapo memory saver into the cigar lighter.
I clean underneath applying backing soda all over and rinsing it off with water from a gargen hose.
If it needs repainting I use Zinc chromate primer and spray OEM color.
I sand the nasty spots on the tray and refinish it the same way.
IMPCO has a pad for under your battery to check the corrossion, but then you wouldn't clean those critters from underneath, could you?
Happy Trails Beep Beep from Houston!!!
Donald, El Cheapo