<human>: Goal: To prevent soap scum in the shower,

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS:
- scrub the shower walls at least twice a year with a scrub sponge and soap scum remover.
- scrub the shower walls at least twice a week with a scrub sponge and soap scum remover.
<bot>: scrub the shower walls at least twice a week with a scrub sponge and soap scum remover.