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When you blow on the glass, your breathe condenses and provides a small amount of fairly hot water on the lens which helps clean it.

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Q: Why do some people blow their eyeglasses before wiping them with a piece of cloth or tissue paper?
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Related questions

How does tissue paper or cotton buds look after wiping your nose with it?

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No blood when wiping but the next time there is why?

Why spot of blood on toilet tissue after peeing.


What are different ways toilet paper can be used?

Toilet paper can be used for its intended purpose in personal hygiene, such as wiping after using the bathroom. It can also be used to blot oily skin, clean small spills, or even as emergency tissue for sneezing. Some people use toilet paper for crafting or as a substitute for tissue paper.


Everytime you go to the bathroom and wipe yourself this thick and creamy discharge appears on your tissue is this normal?

What part of yourself are you wiping?


Why wiping spoons and forks important?

Wiping spoons and forks before using them removes any dust, debris, or residue that may have accumulated on them. This helps ensure that your eating utensils are clean and hygienic before you use them for eating.


How long to keep wood stainer on before wiping off?

Follow the instructions on the tin.


Jupiter's wiping out of humanity also wipes our their immorality?

Jupiter caused the Great Deluge, a flood, because in Greek Myth the Bronze Age (a race of people before humans) were corrupt.


What is the proper wiping method?

I'm not sure what you mean by wiping as there isn't much information in your question. However if you mean wiping when on the toilet then the correct wiping method is wiping back to front until the tissue is clean. Wiping from back to front after urination can cause urinary tract infections by bringing bacteria from the rectal area forward into the vagina. The proper method is to wipe from front to back and then drop the tissue, unfortunately we usually do these things the way ours mothers did, whether it was right or wrong. Both of the above answers are correct. Males can wipe back to front, but females should wipe front to back so any bacterial from the feces will not get near the vagina causing an infection. For males, when wiping from back to front, it's best to hold your testicles up and out of the way with one hand while wiping with the other. Less is more with the TP, too. use about 5 sheets, folded, not clumped or wadded. And do not wipe further than you need to. Just clean the anus, don't drag it up onto your taint.


What is a courtesy flush?

A courtesy flush is flushing the toilet immediately after defecating, before wiping, in addition to the normal flush.


Should you take your guinea pig to the vet if he has eye boogers?

Try just wiping them off gently with a tissue, first. If they persist and seem to be effecting the guinea pig's vision, take him to the vet.


How do you clean dirt off computer keys?

um well wiping it for a start is good, i don't suggest running it under water though or it will get damaged. :) then dry it with tissue or a towell would be better. :)


If you have pinkish red discharge after wiping but just had period 4 days before?

That is called spotting. Women often spot the day before or a few days after their period.