The wonder powder! Use in practically everything from baking to cleaning.
 
Odours: add a tablespoon of bicarb to your laundry load if it's a bit pongy!  For underarm odours on garmets try rubbing a thick paste of bicarb + water onto the underarm area.  Leave for an hour then wash as normal
 
Tea stains: bring your brown-stained teaware back to life by adding around 1tbsp (depending on size!) to a wet pot or mug.  Use your finger (wear rubber gloves if you prefer) to rub away at the stain.  Rinse in water then repeat with any stubborn stains.