In this task, you're given a context passage. Your job is to generate relevant questions that can be answered by directly referring to the passage.

If there's one cleaning task I used to put off the most, it was definitely cleaning the shower. I mixed up a batch of the homemade shower cleaner and sprayed it liberally my bathroom shower, which needed some serious help at the time. The homemade shower cleaner consist of  a spray bottle, 1 cup of dawn dishwasher liquid and 1 cup of vinegar and regular water. After I sprayed my homemade solution around the shower I let it sit for around an hour. After an hour, I grabbed a scrubbing brush and began to scrub away all the mildew stains that were in the shower. I find it best that you have the bathroom well-ventilated when you start scrubbing because you don't want to inhale all those nasty chemicals when your scrubbing away at your shower. After I finished scrubbing away all the shower gunk I turned on the shower and let all the dirty water and cleaning agents flow into the shower drain.
Why did they clean the shower?