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

How to clean windows professionally
Get the right tools.
A good squeegee rubber is the first and most important tool of the trade. Squeegee blades are cheap, change them often.

Available choices:
1). Get an electric squeegee if there are no water leaks available. In heat and environment they can be difficult to remove..
2). Always start the job with a clean scrubber or lamb's wool applicator. Scraper blades are changed at the beginning of each day..
3). Have plenty of plastic to cut smaller pieces or use for soaks. Read up on the tools you need..
4). The most effective option is soft pad squeegee. Any carpet squeegee is fine to use and clean your windows automatically with..
2).