Those are called Spring Hose Clamp Pliers..
get them at your FLAPS.
Napa Auto parts carries them.
the come straight, or angled,
and a version with a long cable so you can undo one of those beyond
reach somewhere.

but why use those dangerous things over ?
Their only real purpose is faster and cheaper vehicle assembly at the
factory .
If there's an aluminum nipple under the hose, ..often that aluminum
surface corrodes and the spring clamp doesn't squeeze well enough to
seal well.
A good german screw hose clamp with curled up edges is perfect.
And re-useable nearly forever.
The typical wide sharp-edged amercian screw hose clamp is bogus too.

On 6/8/2012 4:35 PM, JRodgers wrote:
> I'm sure there is a tool to remove and reinstall VW factory hose clamps
> but what is it? And where could I get one? I want to remove the hose
> clamps on the rear heater hoses and would like to reuse them - among
> others on my vans. Hate to destroy them. Anyone dealt with this before?
>
> Thanks.
>
> John
>