I'll second the Makita 18V Li-Ion blower. Since I already had a set of Makita 18V cordless tools (Drill and Driver)with batteries, I bought the one without the battery.
When I had lots of Geeks On Call franchises (computer repair business) we were always looking for ways to blow the dust out of computers. I bought the 4.0 horsepower MetroVacs, but they were a lot for my techs to lug around. Did OK on the dust in the computer fans, but not excellent. Smaller MetroVacs just didn't do the job.
My techs' favorite was cans of compressed air. But, with 12 techs on the street, the weekly bill for compressed air cans was out of control.
I stumbled on the Makita blower (on sale at the time for $59 without a battery), and since it used the same 18V batteries as my other tools, thought I'd try it. Blows away everything else I ever tried

On both the computers, and my cars.
The Makita blowers have 3 speed settings, and are light and easy to maneuver. Battery lasts about 12 minutes on high, which is usually enough to blow the water off the car. The 3.0 Amp Hour batteries recharge in about 30 minutes. The 1.5 AH batteries only last about 6 minutes, but recharge in 15 minutes.
It seems almost as powerful as my leaf blower, but it's a LOT smaller. And, there's no cord.
This is the description of the blower
Makita BUB182Z 18-Volt LXT Lithium-Ion Cordless Blower - Bare-tool
If you already have Makita Li-Ion tools, it's a great addition. If not, the 3.0AH batteries are usually $100 each. Still a cost effective alternative, although you don't have a vacuum cleaner in the same package.
If someone is adventurous, Makita does have a vacuum that runs on the Lithium Ion batteries. Doesn't look real maneuverable, but who knows what could be attached to it.
Best regards,
Jim