Just did a bunch of reading on the SW forum. The "goop" is support wax and it doesn't appear that anyone's found a good way to remove it. However, this was posted by a SW employee (in August of this year):
"Hi all,
Thank you very much for all these techniques!
Great to see a community working together to see what the best way is of getting rid of the support material / wax.
I do can tell you that we do not deliver any of those models with a lot of wax anymore!
If everything goes alright, you should get a wax free model.
Ohh btw, please smell your model! Smile smells much nicer now Smile
If not, please send an email to
service@shapeways.com with a picture of your model, so we can complain at the printing department that they still delivered models with a lot of wax."