|Hi Mary, |
with queries such as yours it is always best to advise the make and full model number of the device concerned.
For your problem, I would start by holding the keyboard upside down, in a position such that tapping blocks of keys, encourages anything underneath to fall out.
Has any liquid been spilt on the kb?
Here in the UK in the cheapo £1 stores, is a usb vacuum cleaner for kb's - wonderful gadget!
Good Luck - Keep us posted.