I'd second
@SJR202 advice, buying a DI Water filter is a much better option than using a blower, as you basically don't need to worry about drying the car at all, even on the hottest of days.
However you might still get the odd drips down the side of the car, from the likes of the mirrors or door handles, which is where a blower would help.
If your looking to dry the whole car using a blower you'll want the most powerful blower you can find, which you want a filter on.
The small blowers only tend to be good for the details rather than large panels.
I bought one of these for computer cleaning:
https://www.itdusters.com/product/xpert/ (it's excellent for that) and have used it on the car several times, and it's fine for the wheels, mirrors & door handles, etc. However for the bonnet, roof, etc it doesn't have enough force or cover a large enough area to make it efficient.
I've also used one of these leaf blowers:
https://uk.worx.com/compact-brushle...-leafjet-20v-with-battery-and-charger-wg543e/, that was the same as the computer duster, didn't have the power to clean the larger body panels effectively.
I will say the battery powered option is much better than the cable though, as you need to constantly work around the short power cable.
If I didn't have the DI filter, I'd have probably bought one of these. Whilst they are cabled they have a long enough hose to reach around the entire car, but still doesn't offer the flexibility of a battery option:
BLO Car Dryer AIR-GT – Powerful, Touchless Vehicle Drying Blo Car Dryer AIR-GT is one of the most powerful Car Dryers on the market, feating twin motors that offer 8HP. This car blower will shoot water away effortlessly, and provide much faster and safer drying method to prevent any risk of marri
www.cleanyourcar.co.uk
The BigBoi BlowR Mini is the ultimate touchless car dryer, designed to eliminate swirl marks and scratches caused by traditional drying towels. Powered by a
www.theultimatefinish.co.uk