comments:
Duckydoo3000 posted on r/advancedgunpla23w
The rubber eraser is good/cheap to try out (e.g. https://www.amazon.com/dp/B00AZEK8TY?th=1). They are easy to use on flat/open surface, but can be tricky in hard to reach areas. Once you've tried out the eraser, and want to get to the next level, look into getting some zippo lighter fluid and cotton q-tips. You will get more control as well as access to more areas.