Hi,
Have tried using a denatured alcohol? It's not advisable to use strong chemicals on laptops since it may damage some parts that don't need the cleaning. You can try a paint thinner but be very careful on using it. Make sure to tape off those plastics parts that you don't need to clean.
Here's also video on how to clean a laptop using some products design for aluminum surfaces.
https
/www.youtube.com/watch?v=uXq01gbgcOE
Hopefully this tips will help.
