This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to clean a dishwasher with vinegar
Empty the washer and pull out the bottom washing rack.
Once all the plates and silverware have been removed from your washer, you'll want to carefully pull out the bottom washing rack. Pull the rack towards you until it slides out of the dishwasher.

Available options:
[I] At this point, the dishwasher drawers will be rusty and rusted. To make sure the load of dirty-up dishes isn't too full, wrap the drawers in plastic storage bags.
[II] Remove the round basket from the top rack. Once the plates and silverware have been detached from the washer and detergent basket, you'll want to remove the basket from the top rack.
[III] Dump the dishwasher cleaner into the sink. You don't want to be using hot water as this will only make the cleaning process much easier.
[IV] Remove any large food debris from the dishwasher drain. The dishwasher drain can sometimes get clogged by larger pieces of food.
The answer is:
[IV]