Multi-select problem: How does the next paragraph end?

How to clean a fiberglass shower floor
Use a nonabrasive cleaner.
If you have a fiberglass shower or tub, it is important that you only use nonabrasive cleaners, as abrasive cleaners can scratch the surface. Try using a dish washing liquid, liquid laundry detergent, all-purpose cleaner, or a soft scrub product.

(i) Make sure you wear a plastic or glass apron to protect yourself, and do not use soap or enzymes. Let the cleaner sit on the floor for several minutes.
(ii) Avoid abrasive cleaners like scouring powder or ammonia. Apply cleaner with a nonabrasive applicator.
(iii) Select a standard fiberglass shower cleaning cleaner. Fiberglass shower floor cleaner is good when it comes to preventing scratches.
(iv) Vinegar is also effective, but only a little more abrasive. Scrub with a square mop or sponge.
(ii)