Store owners some times want to hide the + (PLUS) and the - (MINUS) prefix that is shown along with the product options.
You can do this with a simple template override.
Find the following code and REMOVE them. You will find this code at three places( Line number 36, 62, 90)
<?php echo $option_value['product_optionvalue_prefix']; ?>
Save the file.
Now you will not see the + and - prefixes in product options.