Thanks for this review!
I tried boiling before but never really worked until you stated to keep reboiling!
My modified version (which takes more time) is to use the 60 lorlock (sp) syringe method with fresh filtered hot water to flush them out first, 5 times with just hot water (300ml in total), then a few times with a mixture of very hot water and vinegar. I find the vinegar helps with the crusty stuff on the coil. (don't reuse the water, expel the water from syringe into drain, not back into bowl).
Then I boil as instructed (boiling removes vinegar taste as well).
After all boiling is complete I use syringe again in opposite direction to blow out water since I do not want bacteria from blowing via mouth entering the carto.
WARNING. Next step could be dangerous and may cause property damage:
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Now I strap up to 2 of them on to my ceiling fan blades with 2 thick tight rubber bands and let the fan run for a few minutes with
juice filling end facing outward. Most of the water is expelled that way (I have been able to directly refill carto at this point in a pinch with a dry burn first). Just be cautioned that water will be flinging around the room (cover with paper towel to prevent that, but you will need to change parer towel when its wet to make sure all the water is expelled). It will make the fan work off balance so I tend not to stay in the room when its running in case it falls off ceiling or one of the cartos getting loose may act like a bullet
My modified methods are just a combination of other methods I found work good together. YMMV.