For anyone who is having trouble removing the sticky goo that is left behind after removing stickers from a guitar here is the best way to do it without using any chemicals that could harm your finish:

STEP 1
Start by scraping at the goo with the credit card…this will remove the light stuff.
STEP 2
Next spit onto the goo and swirl it around with your finger…
STEP 3
…next you start working the rubber quite hard in a circular motion until you hear squeaking. The squeaking usually means that you have broken through the goo.
STEP 4
Wipe over with a soft cloth (I like to use a face towel as it is soft yet kinda bumpy)
To remove spit and then scrape again with the credit card to remove the goo/spit/rubber mixture.
STEP 5
If there is still goo left then use the brush and the coin to loosen up the goo a bit and then re do steps 1 through 4.

Hope that helps, Weezerboy.