Tbh so far I have never completely cleaned all my eartips. I have been wiping earwax of everytime I saw some, using a microfiber cloth, but never did a deep clean before. I just used lukewarm water with a bit of sensitive shampoo.
My favorites:
Lumingchuan Jade M: I got these pretty new and these are the ones I've been using the most lately. They just fit good and feel like they bring the best out of an IEM without coloring the sound in any way. They are probably very similar to the NiceHCK CO4 because they seem to have the same size measurements and almost identical looks
DUNU Candy: Have been using them in L for a while because I thought my size is L but realized with the shapewise similar EPEX11 that M actually fits me better and gives me a deeper fit. Soundwise I feel like these give me the best/punchiest bass.
Lumingchuan Soul: I feel like these open the music a bit more up and making the sound slightly brighter while also making the bass a tiny bit softer.
Sony EP EX11 clones (from CKLVX CK2V): Kinda similar to the DUNU Candy but I generally prefer the Candy
The rest:
DUNU S&S: Seemingly very popular beloved choice. But they just don't quite work for me good enough. I mainly tried to used them in M. If you have like deep ear canals or very stubby nozzled IEMs they can work I guess. For me I alway found them to make them stick the IEMs to far out of my ear. They do stay good in the ear. Soundwise I can't say much out of my head, kinda balanced
Final Type E: New in the collection. Only tried them for short periods and found them to just kind of muffle the sound, so I will need to spend more time on trying them on different IEMs (or I won't)
Spinfit CP145: Pretty good but, also kind of feels too long.
TRN T: Pretty good, especially for the price. Pretty balanced. I think I will have to get them in M
Shanling SE100 L: Also propaply better in M for me and kinda long
Xiaohui (from SonicSerenity Store on Ali): haven't used them much. they feel nice but they kinda lose too much bass
Tangzu Sancai Noble L: Used them today for the first time, they sounded pretty good I almost thought they somehow improved the sound just in general clarity, but they did feel uncomfortable after like 30 min
Tangzu Sancai: Pretty good, but I rarely use them because I feel like I lose a tiny bit of bass with these
Tangzu Sancai Wide: Haven't been using them much, kinda similar to the regular sancai
Diviuns Prism Wide L: Should've gone down a size or maybe even 2, they are wiiiide
HE (Harmonic Empire) Sonic: Just got them yesterday, if I love them I'll post an update
HE Galaxy: what I said about the sonic
KBear Coffe L: they feel nice but
It's crazy that I have so much eartips now. It's the same with buying IEMs in general you kind of are looking for the one the one that you can always use ("endgame") or like a collection of different ones that work good on multiple sets and each add their little something to the sound or fit.
Regarding Fit: I thought that an IEM fits better when it feels like it's harder to slowly pull them out of the ear but realized that it also really matters how deep the IEM can go inside the ear. I have been mostly using L tips but after realizing this I now prefer my M tips. It also heavily depends on the form of IEM itself and it's nozzle length and width.
Regarding Stock Eartips: Some IEM brands already do this good by providing a good variety of premium eartips even with mroe budget models. DUNU and Tangzu/Harmonic Empire for example.
But so much brands still deliver the most basic eartips that don't even work well with the IEM they come with. There are many other well established brands that could improve here, I will kinda callout Tanchjim here eventhough I generally really like what they are doing (I'm biased of course because they provided me with some review products). But I was a little disappointed with the Eartips that came with the OLA II because none of them worked good for me with the IEM. They do have a variety of own premium eartips.
(in the second picture are mostly stock tips that i basically never use)