find out how they are going to clean it out?
some garages use a flush but this only works temporarily as the VW dpf's are not designed to be flushed, they are designed to be replaced.
Some garages use the jet wash
![surprised :surprised:](https://www.mk5golfgti.co.uk/forum/Smileys/newsmileys/surprised.gif)
which ever route you choose is going to be costly, the cheapest is to remove dpf & remap.
I have removed a few now due to this issue