Ya cant fight physics......
once a sound is recorded with abient reverb, it's there forever. You can only pull out 630-800mhz and some 3.15-4k to maybe make it sound less "hollow" but you will lose integrity in your sound as well as decreasing your gain (volume).
The best samples would be completly "dry" - as in recorded in a dampened or sound proof room with no standing audio waves.
I dont think getting a tank in a recording studio is feasable.
All in all - the "dryer" the recording/sample - the better....
You can always add reverb to sounds - just cant take it away.
If you could - someone would be able to make ALOT of $$$$
my 2cents,
Waffle