I suspect that you are talking about immersing only the stylus once you have removed it from the cartridge and have, in fact, heard that in other places as being a very effective way to clean the stylus. When a cleaner like the one
@Sgt Shultz mentions is used as he uses it, I would suspect that the stylus never accumulates enough detritus so that an US bath is not needed. However, if a stylus becomes "encased" with foreign matter and this is then "baked" on to the sides as they traverse the grooves of the record at significant pressure and heat, it might be a very different proposition to get it clean again and this is where the US cleaner might excel.....
Some of my ruminations: is there any potential for harming the stylus by dropping it in an US bath? Are there perhaps materials used in some makes of styli that might be more sensitive than others to being submersed in a liquid solution that can contain a variety of cleaning agents? Would it be best to just use distilled water for such purposes? E.g., some of the nude styli from Ortofon were said to be glued on the cantilever with a fastener that dissolved in isopropyl alcohol and the company cautioned against using it in cleaning their styli. These are simply questions I would ask and perhaps some of our more knowledgeable members, I'm thinking re-tippers for instance, might have a perspective on answering. It's good to know that things worked so well in your case,
@bkatbamna and I imagine others will try this method as well. Just trying to make sure there aren't some glaring reasons why one should not in some cases.....