The most important concept you need to know when dealing with cleaning chemistry is pH. (You pronounce it by saying the two letters P & H with no pause between them.) pH is a number which tells you whether a cleaning product is an acid, neutral or a base (a base is also refered to as being alkaline).
A cleaning chemical, or any other kind of chemical, with a pH of 7 is neutral. It's neither an acid or a base. If it has a lower pH, it's an acid and if its pH is over 7 it's a base. pH values can range from 0 to over 13 with the strongest acids having values towards 0 and the strongest bases having values of 13 or more.
A chemical doesn't have to have a value of exactly 7 to be neutral, 6.8 would be a very weak acid and 7.3 would be a very weak base. For most day-to-day cleaning jobs you want to use a cleaning product in this neutral area around 7. These are generally the safest type of cleaning products to use.
However, occasionally you will need to use the stronger acid or alkaline cleaning products to deal with harder cleaning problems. Acids chemically attack and neutralize alkalines and alkalines do the same to acids. As a result, you use acid cleaning products to clean dirt or residue that is alkaline and you use alkaline products to clean up debris or dirt that is acid.
Acid based toilet bowel cleaners are an example of a strong acid cleaner. White vinegar is a much more mild acid. Ammonia is an alkaline so are most floor strippers. Grease is an acid so alkaline cleaners are natural degreasers. You want to avoid cleaning waxed floors with alkaline cleaners because they tend to dull them. On the other hand, many household carpet spills are acidic, catsup and alcoholic beverages for instance. A well diluted alkaline degreaser will work well on these types of stains.
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