Multi-choice problem: Continue writing the next sentence in this paragraph:

How to clean carpet naturally
Use plain hot water in a steam cleaner.
Many carpet cleaning machines say that you should use their highly concentrated cleaner when steam cleaning your carpets. However, using plain water in these machines will get a large amount of dirt and grime out of the carpet, and it won't leave any residue or chemicals behind.

Options are:
(1). This method will not work on hard to clean stains. However, it is a good way to give your carpet a general, all over cleaning.;
(2). You may also opt for a professional carpet cleaner if cleaning a large area like a patio or basement. Be careful of exposing the carpet to high heat.;
(3). To start, you should use the most concentrated cleaner you can find. Do not use machine wash with wd-40.;
(4). Follow any instructions for the machine when using them. Some steam cleaners target the burned carpet instead of the contact fibers.;
(1).