No you can't use human soap, you should use soap made for small animals like guinea pigs.
yes you can
To wash a guinea pig you have to have a sink, soft towel, guinea pig shampoo, perfect temperature of the water and a hair dryer ( only if its cold outside ). For more information: Go to: http://www.wikihow.com/Wash-Your-Guinea-Pigs
i always use baby body wash and it never bothers her skin
once every 3 months
guinea pigs have 24 teeth
NO.If you wash a guinea pig in a week the next week it still be kinda clean but in 2 week 1/2 without washing it it might lose it's trust in you so like clean it with special guinea pig wipes with it so clean and it can trust you forever.
Best once a week because they are fragile
yes it is good to keep them clean they like warm water
If you get bitten by a guinea pig, all you need to do is tap your guinea pig gently on the nose which means "don't do that again" and then go and wash your hands. Don't get all stressed about it, this is perfectly natural for a guinea pig to, especially if it is a young male. Most guinea pig bites don't draw blood or hurt that much, so there's nothing to be worried about.
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It's NEVER a good idea to wash you're guinea pig because it can easily give them a cold or pneumonia. Although you can buy a certain type of wipes for guinea pigs at a pet store that you can wipe them down with. :) Hope this helps you :) I have had two guinea pigs also and this is what we did. It worked fine :) Make sure they are FOR guinea pigs though. :)