If you do not use a clean dropper, the bottle can be contaminated. This can cause an unwanted chemical reaction.
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Long enough to clean the pool.
Around 1000 sq.ft.
Not necessary if the tape is kept reasonably clean.
It will vary from hotel to hotel. The way they do it, is lets say they have 38 rooms in the WHOLE HOTEL to clean. If there are 3 housekeepers for the day, then its 38 divided by 3.
Yes, it can be. But normally the adverb is cleanly. Colloquially, clean may be misused to mean "cleanly."However, it can be used to mean "until clean" and is an adverb in these cases.Examples:"wipe the slate clean""scrub the floor clean""wash the dishes clean"