More for than just earwax
Daughter has an X+ and she did quite a number on the lens. So much, that all of her pictures taken came out ghostly...
I pulled out my handy drill, a cotton swab, some toothpaste mixed with a bit of water, and started polishing that sucker. Did that for about 4 minutes (being careful not to stay in one place too long) and it removed all of the micro scratches she had caused by putting her phone into her rear pocket