Idk if there's a way to clean that...maybe if you turned it on it would burn off?
The heater is like base board I think my mom calls it. Like the ones that stick out of the wall along the floor.
Is it like a vent in the floor or one of the big ones?
I would say in the shower for the garbage. I dont have heater i live in fl so no idea there. Also u can take milk of magnesium or miralax for constipation