Without knowing exactly what your set up looks like (bedroom and ensuite bathroom).. does there happen to be a door that you can keep closed to the immediate toilet area? Where I would guess the sink/toothpaste would be? Whatever immediate area your budgies live in, I would take steps to make it bird safe, and keep all things inappropriate for them out of reach.
Yes, There is a door there, and I do keep it shut at all times except for when I'm in there. They've never played in the sink in there (they prefer showers), and there are other things on the counter, but they all race towards the one of two toothpaste tubes abd start squabbling with each other over it!!
It's not a big concern to me, as I just keep them out of there, but I was curious about the reason they were so attracted to it.