I've had my Mooncup for almost five years, and I think it might be time for a new one. I used to be able to rinse it clean and just use my nails around the lettering, but now stuff sticks to the smooth bits and I have to scrape it off. I think it's been like since soon after I switched from boiling to sterilising solution. I probably underdilute it since I use a very small container and can't be bothered to measure. Has anyone else experienced this? If I've mistreated my cup, I don't want to do it to a new one.