Here is a how to with full instructions on how to de-badge your Astra, not for everyone but i prefer it
Firstly, sorry about the state of my car, its very dirty, I KNOW
You will need:
Nylon thread or fishing wire (nylon string off an old kite works the best)
Tar remover
Credit/debit card
Color coded polish (not the people)
BEFORE:
1. Put the string behind the first letter, you need to be holding each end of the string in each hand, you may need to use a finger as a guide to get it under the letter.
2. start pulling the string side to side is a sawing motion, it uses a combination of friction and heat to remove the bond.
3. move through all of the letters you want to remove, some people just remove some, I removed all
4. Pour tar remover onto a cloth, dampen the sticky residue and leave for 3-4 mins
5. Use a card to agitate the residue left over
6. Wash over with water and polish
And that is it all done.