For long hair, wash them, dry them on the cool setting, and brush them.
Short hair, brush them.
The best thing to do to a guinea pig with badly matted hair is to cut it off. Trying to brush it out could hurt the guinea pig.
The best method of hair removal for men is by waxing or shaving. You can read more info here http://www.askmen.com/fashion/trends_100/103_fashion_men.html
guinea pigs are born with fur unless the are skinny guinea pigs ( breeds with no hair)
Washing up liquid is not meant for hair. It can strip the hair of its natural oils and cause dryness and damage. It is best to use products specifically designed for hair care, and to follow the instructions on the label for how long to leave them in your hair.
Yes, repeated washing dry your hair.
Yes, in theory hydrating shampoo is going to be better for hair than regular shampoo - but it depends on the ingredients. But shampoo in general is not healthy for hair as it strips the hair of natural oils, if you want stronger hair you might want to consider ditching shampoo for no-poo method of washing or conditioner-only washing.
no but washing your hair to much is bad
Wash them, showers and washing machines work the best.
There is no "better" way; hair extensions are hair extensions. The method of application is completely up to the wearer.
The best hair removal method depends on the area of the body and type of hair. Creams like Nair and Veet work better on hair that is not too coarse. Any hair removal method might cause a reaction especially on sensitive hairs like the face.
No, it isn't. By washing your hair everyday, you're getting rid of your hair's natural oils that keep it healthy.
Softens and helps damaged hair.