Rice never, NEVER, does any good to electronics. The myth on the net that you should put electronics in rice to "dry them" is wrong and can even cause additional damage. So for whatever reason you put it in there take it out.
Rice doesn't dry anything (in fact just letting something sit in a warm dry place is much more effective) and you don't want to let water sit and dry on electronics anyways. You want to wipe and/or displace it (like after a toilet session you wipe your .... and don't let it dry, right?).
Next: why did you put it in there, what problem did you try to fix? Did you drop it in water? Is there
eliquid on the board?