Anyway, the bottom surface has a bit of dirty-looking residue, and I really haven't had luck getting it out. Have tried things like Bon-Ami and other non-scratching powders, but without much luck. I have put water in the tub and added a bit of bleach to it and let it set, but that didn't help. I have used Tilex. Have used general bathroom cleaners. This tub isn't really used very much, and we always clean it after every use. (It's just my husband and I.)
Another thing is about the Jacuzzi part of the tub. One time when we hadn't used it in a while we turned the jets on, and this dark looking stuff came out. It looked somewhat like small pieces of very soggy grey cardboard. I've wondered if it is some sort of mold. Anyway, I filled the tub and poured a lot of bleach in and let that run through the jets and we could use the Jacuzzi for a while. But then in a relatively short time it happened again. We have lived in this house 12 years, and this only began in the last 2 years.
Any ideas about these two problems?