I haven't looked at my cup since my last period. I have been storing it in a box with a couple tampons between periods. I haven't boiled it since I first got it in may and it was fine after. I had done a couple vinegar soaks and a couple with some peroxide. I did use a bit of coconut oil as lube my last period per precious stars pads she recs using that or water based lube. I used a bit my last period especially when it was lighter at the end. I hope I didn't ruin it I can't afford a replacement right now with xmas right around the corner. Help. The powdery residue washed off easily when I washed my cup. When I put it why I remember not really drying it just putting it away.