Grout Removal from Corners - Grinding Tool?

[mousedog21]

The grout in my bathroom was very old and dirty and I successfully buzzed it all out of the straight, flat lines with a Dremel tool using its carbide blade attachment. However, I can't seem to find the right blade, attachment or tool that will help me get the grout out of the 90 degree corners. Any advice would be greatly appreciated! Thanks.

 

[Albert]

If you have or have access to a multi-tool, the blades are offset and should enable you to get into the corners

 

[mousedog21]

If you have or have access to a multi-tool, the blades are offset and should enable you to get into the corners

Thanks, I'm reading up about the multi-tools now! Hopefully I can find the right blade/attachment to get Into the corners.