Thank you. This morning I lost one of my RGP lenses down the bathroom sink! I have an older back up pair, so I reached for those. However, when I opened the case, the solution had mostly evaporated, leaving a gummy residue. I was able to rinse that off fairly easily, & I let them sit in the soaking solution all day. Do you think these lenses are safe to use? ( I inserted one of the lenses for a moment, and it felt comfortable, but I was afraid to try wearing it, so I took it out.)