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

How to clean windows
Clean stubborn stains.
Outside windows are especially prone to stubborn stains because they are exposed to hard water runoff, minerals, bird droppings, and elements that can cake on dirt and grime. There are a few methods you can try to remove marks on inside or outside windows :
Use a mineral deposit removing cleaner, such as clr.

OPT:
[I] Dirt is a mineral which is used to take out unwanted dirt and grime from inside windows. Dampen a cloth with a small amount of mineral deposit remover.;
[II] Install window cleaning cleaner or an anti-dust or chemical cleaner, such as windex. Wait a day after your window cleaning to clean the glass.;
[III] Wear gloves while handling pots and pans and use a broom to wash the inside and outside of windows. Try a solvent cleaner instead of a commercial cleaner, such as wd-40.;
[IV] Dampen a sponge with cleaner and rub at the stains on the windows. Rinse the area with water and proceed with regular cleaning.;
[IV]