So I peeled up the bath mat to clean the bath and the underneath was all black with mildew and whatnot. Ew. I soaked it in caustic soda, then rinsed and scrubbed with some bubble bath we don't like anymore.
It's still so horrible
I know it's the underneath but I have to bathe on that. What can I do to get it off? Or is it time for a new one?