Most aggressive WFP brush for uneven surfaces?

I have some weird some vertical vinyl siding that has really deep grooves to clean. Soft washing will not dissolve it. I need more scrubbing power then my Unger flocked polyester soft siding brush.

When I go back to this project, instead of spraying and scrubbing, I am also going to run a detergent through my wfp for some extra cleaning ability as I scrub. But I need to get a separate brush for this as I don’t want to use the only wfp brush I have right now. A Tucker Hybrid.

What would be the best brush?

Unger Green Sill Brush - gets great reviews for it cleaning ability on WCR. But I remember Chris saying in a video that they are not very aggressive as they are made for the UK market with weekly cleans. The sill design, would be of a benefit I think.

New NorthernLite Elite - Dupont bristles are stiffer? @beautiful-view

The Tucker Nylon is always a fave, but not sure for this purpose.

Gardiner makes a stiff or medium stiff sill brush. But not sure if I can get one easily. They have way too many brushes!

Or is boars hair or hybrid the way to go? I know they are aggressive, but the bristles will need to get in the groves.

Appreciate any feedback.

The Unger Nlite radius brush will do fine.