How to remove leading and trailing whitespace in a MySQL field?

I have a table with two fields (countries and ISO codes):

Table1

   field1 - e.g. 'Afghanistan' (without quotes)
   field2 - e.g. 'AF'(without quotes)

In some rows the second field has whitespace at the start and/or end, which is affecting queries.

Table1

   field1 - e.g. 'Afghanistan' (without quotes) 
   field2 - e.g. ' AF' (without quotes but with that space in front)

Is there a way (in SQL) to go through the table and find/replace the whitespace in field2?