try and get a caramel wheel from a local paint shop supplies place,
looks like this:
![Image](http://www.completepaints.co.nz/images/products/TLH4100%20Caramel%20Wheel.jpg)
not sure on the correct name, but everyone i know in the trade calls it a carmel wheel! basically an eraser, work amazingly well, very easy to use and won't damage the paint underneath
and on the subject of DX rub strips, there's a DX round the corner from me with full plastic strips, same ones as a GL...