It's like with the laundry: you don't boil all of it every day but wash it at an appropriate temperature, depending on material and dirtiness. You'd boil underwear and sports wear but wash a blouse at a much lower temperature and have a fine and rarely worn silk suit cleaned only once in a while.
Wait, BOIL your clothes?!? I've seriously never heard of this. Everything has always just gone into the washing machine.
A hundred years ago, before modern detergents, people used to boil bedsheets, towels and underwear to sterilize them. Never heard of anyone doing it in this day and age.
Blame it on my lack of appropriate vocabulary. Laundry details aren't exactly the stuff you find in school books.
Every washing machine has different programmes with different temperatures. The programme for white wash (undies, bedlinnen, towels) washes at approximately boiling point (around 90-95°C) which is why in German we call this sort of laundry "Kochwäsche" which translates as "boiling-laundry". It used to beb boiled in kettles and nowadays it's being boiled in washing machines. Different tool but same procedure.
Could someone perhaps supply me with the correct English word? I can't find it in an online dictionary.
It's generally recommended by doctors over here to not shower daily.
Why?
That's a tad difficult to explain for 2 reasons: I have to explain a complex ecosystem to a layperson (no offense meant but afaik you are no biologist or MD) and in addition I have to do it in a foreign language and given our past misunderstandings you are only too aware of my limitations there. So please be patient with me and if I don't explain it properly, don't hesitate to ask.
daily showering is considered risky by our dermatologists because it destroys the skin's natural bacterial flora that supplies us with the vital acid mantle. Without that and without the good (symbiotic) bacteria settling on us, the skin is completely defenseless against bad bacteria that then can enter the body through the skin's pores or through tiny injuries (sometimes even through the skin's cells themselves) and cause quite serious infections, inflammations etc.
This wikipedia entry is just short but explains it nicely:
http://en.wikipedia.org/wiki/Acid_mantle
You can minimize these negative effects by using soap with a skin-friendly pH level (5.8 is generally recommended), for example a soap that's used by surgeons. And you should always use a cream or lotion or oil after showering so that the skin doesn't dry out and get brittle, leaving tiny wounds through wich bad bacteria and viruses can enter your body.
However, the dermatologists stress the point that all this can only minimize the negative effects but not completely erase them. Hence they recommend to shower only avery second or third day to give the skin and it's protective bacterial flora a chance to recover.
I'll see if I can find a suitable article online that explains it in proper English and in greater detail.
Edited to add: this one is not bad, though it doesn't offer as many details as I'd have liked:
http://www.med-health.net/How-Often-Should-You-Shower.html