For the undercarriage hardware and tires I’ll use a little stiffer brush and scrub of any dirt and debris from the landing jacks, stabilizers, slide rails, steps, rear bike rack and bumper, suspension parts,etc. Then give everything a really good rinsing at high pressure and an application of dry type lubricant to avoid attracting dirt. My favorite is Protect-All Slide out Dry Lubricant. The wheels get a good cleaning with soap and water, then some UV protectant on the tires and aluminum polish for the mag wheels.