You could try looking in the cloth nappy section below...and perhaps do a search.
Sounds like you need to do a strip wash. You can do it using dishwashing liquid, about 1/4c of cheap stuff and hot water...then rinse, rinse, rinse until no bubbles remain...
Alternatively you could get some Rockin Green and do an overnight soak and they'll come up really well.
I personally never use baking soda or vinegar on my nappies as it can damage the elastic and PUL over time...it is also not that great for bamboo or other natural fibres.
You'll find heaps of helpful information in the cloth nappy section...