Cleaning Conicals

[Ciderhead]

Aimed at those who work in labs with glassware can anybody tell me how I can get off burnt DME on the inside from a starter I made.
Funny thing is I always add water first so I don't know how it got burnt.
I've tried VWP a couple of times with a bottle brush but no joy.
I was thinking soda crystals?

[Ciderhead]

Aimed at those who work in labs with glassware can anybody tell me how I can get off burnt DME on the inside from a starter I made.
Funny thing is I always add water first so I don't know how it got burnt.
I've tried VWP a couple of times with a bottle brush but no joy.
I was thinking soda crystals?

[Ciderhead]

Noooooo 
I gather HCL will do it but was looking for something across the counter

[johnrm]

Neat Amphoclen? 

[Shanna]

try rhubarb and lemon juice heated in the conical. should help break down and lift off the carbon from the burnt dme

Declan

[Greg2013]

You can buy HCl OTC in the hardware. Its in certain types of drain cleaner, although the vast majority are sulphuric acid so check it first

[DEMPSEY]

Who needs school,you get better chemistry lessons here,mcguyver style.

[Ciderhead]

Ok got drain cleaner from Hardware store and its 95% surphuric 
I poured it in and I kid you not there was fizzing and lots of smoke, burnt DME all gone
Jesus whats in that stuff

[Tucan]

Be careful with sulphuric acid as it can etch glass if left in contact for long enough.

[Ciderhead]

Be careful with sulphuric acid as it can etch glass if left in contact for long enough.

My conical now has a lovely gents lavatory ming, only joking it was rinsed for 2 mins after the 5 min soak, i was shitting myself to pour it down the drain.

Hmmm sulphuric and sugar 

[media]http://www.youtube.com/watch?v=_gG0UAX3V7c[/media]