no never heard that 1 befor.
I use my ultrasonic cleaner for all my glass…Haven’t had any issues. Saw somewhere on the forum to put a sillicone pad at the bottom just to be safe and I haven’t broke anything yet. The thing is I find some of the sugars used in SPD is very hard to clean off, even with the help of ultrasonic and heat it still doesn’t come off. This is what happened to me
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Lol I meant to tag @Digni, sorry 
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So after all my battles trying everything listed getting my flasks cleaned (and failing) I finally came up with a simple solution.
Somewhere above someone mentioned using a kiln to burn off the residue, well i don’t have a kiln but i remembered how well my self cleaning oven cleaned off baked on grease and sugar on the self clean mode.
After 3 hours in self clean I have a brand new looking flask!
I wish I had a before picture, it was horrible though!
Try it!
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It looks great! I wonder, though, what effect this is having on the annealing of the glass. The self-clean temps on an oven are the same as used for the annealing of glass (about 900F). There is very specific protocol for how to anneal glass being used in a high-temperature, extreme-vacuum setting. I’m not sure your process for cleaning complies with that protocol.
You may have inadvertently made the glass very brittle and subject to failure with little effort. I’m not saying that you did; I’m merely cautioning you to be EXTRA careful when using the glass cleaned by this process. PPE, which should always be used anyway, is of the utmost importance. Implosions can be life-ending if one is in the wrong spot. You may want to look up the annealing process to learn more and see if what you did comes close. 
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Hmmmm this gives me something to think about, I had thought borosilicate was rated up to 500c working temps.
Now I’m scared lol, I may just scrap these for new ones.
Maybe research before scrapping. I just know that glass is usually annealed at 900F, so I wanted to be sure to say something in case there was an issue. Keep the glass you cleaned this way marked as such and separated from the rest of your glass until you research a bit. I have an acquaintance who blows scientific glass. I’ll ask him tomorrow what he thinks.
Yeah I’ve been looking at things since you said something trying to get an idea. That would be great to hear from an experts opinion too if you have a chance to talk to him.
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Hey @Akoyeh any word from your glass blower acquaintance?
Hope everyone had a good Halloween!
He’s still out of town, I think. I’ll try reaching out again today. As soon as I hear back, I will post it up. Sorry about the delay.
@spdking - thoughts on this cleaning method?
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Thanks brotha! I really appreciate it!
Interested in his input as well…
did you try hot water
Hot water and Alconox is good for a lot of stuff, but hard to reach areas in the top of large flasks (10-20L) is still really tough for me to really clean.
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i use ethanol, limonene, and water mixed. add rock salt to scrub if its really bad, wash with ethanol after
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be comfortable shaking the shit out of your flask by hand. same method as cleaning a bong.
probably harder on a 20L, doable on a 10L though. i used to run a LS 12L and had to clean cbleach and all kinds of fun shit out of it
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There’s some shit that just chars on that the only way to remove is to toss in the garbage or burn off. I haven’t tried the more caustic solutions, but i tried everything 3lse mentioned here. At the end of the day I’d still rather pay 60 bucks for a new flask than go the caustic route anyway.
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60 bucks? wtf where