Thank you for your message, welcome to the community!
May I ask why you need to remove the grill of your SoundTouch 130 system?
We would not recommend that you attempt this yourself as if your product is still within its warranty period this would void any time left on this. If your speaker is in need of any repairs I would recommend you get in contact with your regions official Bose Product Support and an agent will be able to process this for you. To get in contact with your regions Bose Product Support please select this link , choose your region and scroll down to 'contact us', there you will be provided with the appropriate information.
Alternatively if you are in the US or Canada online service is now available via the Bose website.