A hot ISO dunk worked well. The best and easiest way I've found is using hot PBW water with an ultrasonic cleaner. It's hands off, dead simple and very effective (and not very expensive, a small ultrasonic cleaner is inexpensive on Amazon). Mix and press some buttons. Before when using ISO I mentioned here that I would rinse the ELB with hot water under the tap from time to time with use (between big cleanings). My guess is that there was some residue left on the ELB with ISO use so it collected more residue before long. With my weekly PBW ultrasonic cleaning I never had to do any more than quickly brush out the ELB from load to load (and there's a link to great brushes for the ELB and nail mentioned here, 50 for $8, enough to last me a lifetime of use and cleaning).
My cleaning frequency is higher than others, but that's just personal preference. I like pure flavors and clean vapes and clean it as such so there is no appreciable resin accumulation with the EVO/glass. OTOH, others here are fine with a low frequency cleaning schedule, others also incorporate resin recovery too. The EVO works well and is very flexible.
I saw your other post about the ELB and offer some feedback here. The ELBs aren't for everyone but I really like them and find they have a lot of merits. The ELBs are durable in my experience. I'm still using the same single one I started with almost a year ago now. The EVO has a great product support ecosystem and there are multiple ELB loading tool options, from a number of single funnel setups to multi-ELB loading trays. Loading can be done in seconds and it isn't finicky with good tools such as these. And the EVO ELB setup is great for groups. You can set up a vape session for many people without having to reload, unlike the FP and most other vapes, just preload ELBs and pop them in the EVO heater when vaping (or nails of concentrates). Everyone can even have their own ELB or nail of fresh product; no sharing of a cannabis load, just pass around the heater. And the heater can keep up with even the largest groups vaping back to back. The EVO heater is very highly rated and has been measured at 100 W, which is the same as the power rating of the Auber controller for the FP for example.
No matter what you look at for a vape, there will be cleaning involved, and a big part of what drew me to the EVO was its simplicity and easy cleaning. It's been great to have a simple and easy to clean vape. I need low effort stuff like this to keep on top of it
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Anyway, good luck with your search.