Activity of cornflake girl

I stepped out the shower about 10 minutes ago to discover some creature climbing up the sloping ceiling near the velux window. On close inspection it looked like a ladybird but was black and I could just about make out a faint orange spodge on its...

I know a few of you have this in your bathroom. We've got the kind with the disks all over IYSWIM. It's looking grubby (we chose a mid grey colour) round the disks. What do you use to clean yours?