funny, I worked so hard to get those kind of checks on one of my builds. It took sessions of in the freezer vs heat gun vs cold air blast from air duster... then you get them accidentally. Honestly, you could totally leave them and it'd look great but I'd understand the desire to get rid of them.
I was just looking at a tutorial on stew mac regarding this. There was a gal there who was using lacquer retarder and a fine paint brush to melt 'deep scratches'. Might be worth a look, just thought I'd mention.