In the kitchen, there is a very stupid arrangement (we can't change it - rented flat), where you don't have any drainage board built in, and the worktops are all wood. Instead, there's a plastic drainage board that sits on the worktops, which obviously is not as efficient as it should be. As a result, we've started getting black mould around the join between the worktop and the splashback, and around the sink.
I'm a total housekeeping amateur - what do you all suggest for cleaning this off, and for stopping it growing?