Bacteria are ubiquitous (that is everywhere) and while some are harmful (pathogens), most are good for you. And you are covered in them both outside and inside and this is OK.
Thus if a DOCTOR has diagnosed a bacterial infection (a harmful type) on or in your body, the doctor will tell you how to treat it and cure you.
However, if you are not ill then there is nothing to be worried about, simply keep yourself clean by washing with soap and water each day and you will be fine.
Note. Completely removing the good bacteria is harmful and leaves you open to infections caused by other types of organisms (funguses).
Filamentous bacteria is sometimes found in the wastewater treatment system. This bacteria is seen as beneficial, but can be filtered to remove it from the water system.
Chlorine is an effective agent against treating your pool against bacteria. You can buy supplies to test and treat your pool at pool shops.
When you shampoo your hair you remove dirt and oils. The dirt has to be removed because it can harbor bacteria. The oil may be natural oil, so a bit of it is good, but too much can clog pores and leave your hair looking greasy.
To prevent hair ticks on your pet, regularly check their fur for ticks and use tick prevention products. To treat hair ticks, carefully remove them with tweezers and clean the affected area with antiseptic. Consult a veterinarian for further treatment options if needed.
You will have to color your hair.
Some people have bad body odor even after showering because the soap and water does not remove all the bacteria from the skin. The body odor is caused by bacteria. Sometimes shaving the hair from under the arms can do away with the offending bacteria. Then the soap and water can remove it from the skin.
When bacteria become resistant by adapting to their environment they become harder to treat.
It is undesirable to remove bacteria from the skin because some of the bacteria is good bacteria and is part of our body's natural protection.
Penicillin does not clean the urine. Penicillin is excreted via your urine. It is also not used to treat the urinary tract infection. Most of the bacteria that cause the infection in the urinary tract are not killed by Penicillin.
Bacteria
With antibiotics.
When bacteria become resistant by adapting to their environment they become harder to treat.