In my opinion, it doesn't matter as long as you rinse it off really well. I'd happily use dish soap on my cup. I also use shampoo sometimes.

But some of us say that using soap with glycerine gives/has given/may give them a yeast infection.

This! :o)

The above comment about rinsing is likely very true.

But if you're looking for the ideal soap, I'd say use castile. My impression is that it's mild (i.e., not "antibacterial"), and vegetable based.

I'm curious to see what others say....

Castile soap (in its pure form) is just soap made with olive oil. It's fine, mild, gentle for the skin, but not actually anything super duper special. :)

I personally use Johnson's baby shampoo (rinsed very well) and find that works well. I have also used the soap that I use for my body (Cusson's Pearl) with no ill-effects, though of course others may have different experiences.

I would say that whatever 'mild' soap/feminine wash you use to wash your vag with, will be just as good to wash your cup with (rinsed well to prevent any residue)

of course, lots of cup users just use water :)

This, I use whatever feminine wash I'm using on myself at the moment. And rinse it off well.

Yep, I agree with what's been said. Personally, I choose to use Dr. Bronner's unscented pure castile liquid soap on my cup. I've been using it for nearly a year now and I've never had an issue.

I wouldn't worry about vegetable-based soaps unless you have a moral objection to the use of animals... when it comes to real actual soap the safety of the final product doesn't change if you use palm oil or lard. Other factors (like the hardness of the bar and quality of the lather) change, but not anything to do with safety.

Soap is a word people use for all kinds of things, which, to me, fall into three basic categories.

1. Soap
2. Soaplike soap-derived things
3. Detergents

Soap is a saponified mixture of fats, oils, and lye. It's been around a really long time and is pretty cool stuff. Handmade soap is generally gentler than industrial (higher levels of fat and industrial processing removes the glycerin). Soap naturally has a scent; other fragrances are often added. Other than in a few rare cases, real soap is solid (Dr. Bronner's is an exception, and it's possible to make liquid soap, just complicated and uncommon).

Soaplike things - this is what the glycerin removed in processing is used for. Those pretty clear bars of glycerin soap? that's what they are. Nothing terribly wrong with it, but they're not soap, they're bars of glycerin.

Detergents are what's in shampoo, body wash, nearly anything liquid. They aren't soap even though they lather and have surfectants and get you clean.

I don't actually wash my cup with any of these - just use water, boil once in a while - but lots of people do. If I did, I would choose based on what I'd rather have left behind if I didn't rinse well enough, just in case, so I'd pick a regular old soap (easy, because I make it) with either no scent or essential oils that I know are safe. Glycerin can prompt yeast infections for some people, and I am uncomfortable with detergents and their potential effects on long-term health.

All that said, as long as you rinse well, I don't think it matters. :)

I use Dr. Bronner's! The same peppermint stuff I use for everything. Also I pretty much only soap it once every day or two. Often just rinse.

Thanks for all your input and advice. I am an ethical shopper so Johnsons and many brands' feminine washes are out (I'm a soap and water girl anyway).

I have a friend who manufactures and sells liquid castile soap which I already have so I'll use that. Thanks again:)

I was using my Dr. Bonners, but that gave me yeast issues (I guess it's the glycerin) so I'm going to stick to my unscented Sliquid Splash feminine wash I use for my lady parts.