When the washing up is done I always give the sink, strainer and plughole a going-over with the scouring pad/steel wool and washing up liquid. The sides of the sink no longer feel like they’re clean. Drain, strainer and base of sink are clean, but there’s a vaguely gunky feel to the sides of the sink, sort of where you might expect a tide mark if I was washing up with the plug in. (Which I don’t do.) I’ve tried various stronger cleaning chemicals, but nothing seems to make a difference.
Any suggestions?