I happen to like the little bottle, it's pretty conservative with iso (I don't dump it with every use, as I would with a ziplock). I usually have the luxury of soaking one overnight or longer while using another, or pfe.
But
@Mr Mellish , I think it is mainly for the mouthpiece (aka front end). Or some stash.
The mouthpiece cleaning discussion has reminded me, and I wonder if anyone has similar reservations or experience;
A couple of years back a SS front end got the 'loose screen' syndrome. The screen in mp can come unscrewed if resins 'glue' it to the body and you then try to spin it off . You can screw it back in with fine-point tweezers. While the screen was out, I managed to remove two inner linings to the cone-shaped end. One is metal the color of copper and the other is some type of 'plastic'. Around both of them was an appreciable amount of residue (resin). This was right after a 24 hour iso soak, with requisite occasional shake of the container.
At the time I was pretty bummed to find this resin trap right in the mouthpiece. I can believe that this can happen to all hopper standard front ends. We have no reason to think the design has evolved. I switched to pfe and didn't even use standard for a long time. Pfe has no internal parts, what you see is what you get, and it's easy to clean. Usually I hold it with tongs under very hot tap water for a minute, then swab out the inside with a paper towel to be sure threads are clear.
Time has gotten me past the hesitation and I'm finding std mp very pleasant to use these days, only use pfe for water tool. I have to use silicone for the heat 'cause I can't stop with one or two pulls so it do get hot. But I always have one in the soaker bottle and swap once a week or so.