Write the next sentence in the following story.

How to make soapy ammonia cleaning solution
Locate concentrate ammonia solution.
It's readily available in supermarkets in the household cleaner sections of larger supermarkets in the us. Otherwise, try hardware shops and places that sell industrial cleaners.

Select from:
I. You will probably want to buy the smallest possible bottle since you won't need a lot. Use rubber gloves and goggles-ammonia can burn skin and eyes..
II. Look for plugs and valves which is not oily. Dishwashers and dryers are also good places to find concentrated ammonia..
III. Get into the habit of replacing spills. Every time you add dishwashing liquid onto a sink or toilet, add a dab of concentrated solution to the water..
IV. Fortunately, it comes in liquid form, rather than bath/shower cleaning liquid. This liquid can also be water, soap, detergent and other products... The answer should be
I.