[Telamond]

So I managed to build up a stock of dirty NMR tubes (lazy me) and I was wondering if there was a fast way to get them clean? The way I do it is just to pipette in water/acetone (alternate that 5 times). So if anyone have another way to get them cleaned up, please share tips! 

[stewie griffin]

Make yourself an NMR tube cleaner:
http://www.thechemblog.com/?p=878

[408]

I built a cleaner based on the same concept as the one above.  But I miss my bachelor's work where my supervisor's advice was "I want you doing chemistry, a used NMR tube is used, buy new ones when needed and toss the used ones."

[orgopete]

I used different methods. Generally, I just took a handful of tubes and rinsed them with acetone. Separated out the clean from the less than clean. Let them dry and separate them again. Then I'd try rinsing the dirty ones again with different solvents, heating, etc. or use an NMR tube cleaner similar to what Stewie suggested.

It depended on what I wanted the tube for. If I was just checking a reaction, I didn't knock myself out with handling individual tubes. I can add acetone to about 50 tubes, dump and repeat pretty quickly. If I wanted a really clean tube, I just used a new one. (How else can you acquire a stock of dirty NMR tubes?)

[Med90]

you can use NMR jet cleaner. But it's expensive. To minimize expense you can make by yourself as stewie has suggested in thechemblog.
you can watch demonstration in youtube.
http://www.youtube.com/watch?v=AasMEnCtsEI

and for details, plz check out the following blog.

[Dan]

Make yourself an NMR tube cleaner:
http://www.thechemblog.com/?p=878

Yeah, make on of these. We have one based on the same principle too. The major advantage is being able to wash the tube with water or aqueous acid or base - which is not an option without suction due to the high surface tension of water. This is a common problem for us as all our synthetic targets are very polar and usually have to be run in D₂O.

You can also get pipe-cleaners (little brushes) long and thin enough to scrub out nmr tubes.