For the type of jambs OP showed, I would say the small Daytona/EZ Detail brush would work better than WWs since you can flex the Daytona brushes. A lot of times just using a microfiber and your hand works best. I have gotten splattered plenty with the Daytona brushes when I started using them or when in a hurry. But, now I have figured out that as long as I'm not yanking the brush out of the wheel opens I don't really produce splatter. More recently for jobs like wheels, jambs, and crevices, I use some round tip paint brushes I came across at Ollie's Bargain outlet. They are a mix of natural and synthetic bristles, some which have feathered tips. The base of the bristles is about 1.25" and comes to a point of about 0.25-0.5".
A lot of time before anything else I will blast the jambs with my pressurewasher, which usually takes care of most of the job. Painted jambs aren't usually an issue. It's the greased hinges and rubber But that need more attention. More times than less I use microfibers and some apc rather than a brush, unless the specific jambs need more a more aggressive approach. It's always good to have plenty of options on hand to figure out what works best for you and your situation.
Almost forgot to mention steam. Works well and no chemicals needed usually, and less water than PW.