you don't need to change your work clothes maybye you want to change into more comfortable clothes but it's not necessary.
dirty, going out, going to gym, wear uniform
You play with it and change the clothes on it.
You can soak the clothes in water and scrub them then wash the clothes. It might work.
The employee handbook or a manual that states company policy and procedure would determine if you can change clothes at work as an employee or employer.
change your clothes and if that doesnt work change your hair
Yes and shower. Lots of germs in gyms and work out areas
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Im sorry you can't change the clothes in Miku Miku Dance you have to download the PMD editor (don't download the English version because it doesnt work xD) You can find some tutorials on how to edit the clothes (too hard to explain on here)
This is necessary to avoid accidents, cotamination, intoxication, damages to equipments, clothes, etc.
For small amounts of clothes a microwave would work. Possibly a stove might work as well. However in both cases you would have to be very careful and watchful that you clothes neither melted or caught fire
Nail varnish remover. It might need a wash because of the smell though. It might work, i don't know. Try it!
If the excretory system does not work, the person becomes very uncomfortable. It might be necessary to take medication or undergo surgery.