Brother actually cleaning dashboard is a 2- stage process
Stage 1:Cleaning
In this stage an all purpose cleaner like 3d apc, Koch Chemie multi interior cleaner or Tac system multi cleaner is used on dashboard along with a detailing brush. You spray the product on brush and then agitate it on dashboard and lastly wipe it off with a clean microfiber cloth
Stage 2: dressing
In this stage you use an interior dressing like Tac system seal, Koch Chemie top star, 3d lvp conditioner or soft99 luxury leather. You have to apply product on applicator pad and massage it into the leather and after about 30 seconds wipe it off.
This process can be followed for door cards, seats and dashboard excluding fabric. Though this process is time taking but end results are worth it
This will allow your dashboard to be clean and protected by thermal and chemical damage. The products suggested create a semi matte effect but not a glossy or greasy effect.