I don't know how far back you want to go but the ancient egyptians used animal intestines to make condums. Poorer folks used douce washes inserted in the female after sex to try and kill the sperm. They were usually a rinse made with water and vinegar.
what did thety wash their clothes with back in the olden days
Horse and buggy
Yes - for example, you could say: 'In the olden days', and it would make sense.
Yes, they needed them for letters.
yes but it deepends what date
By writing letters
They didn't use this term back in "the olden days." It's a modern term meaning to wait for a minute.
what were shops like in the olden days
yes they did have needles in the olden days
cowrie
there was barter system
Braille came into use by the blind people of the olden days.