Should you use both conditioner and a protectant on interior cleaning?

[mycarmycar28582]

Would an interior cleaner and conditioner be ideal? Or would a clean and like a aerospace 303 protectant be fine? Or all 3? For leather seat cleaning...

 

[uhohitsstevo]

Would an interior cleaner and conditioner be ideal? Or would a clean and like a aerospace 303 protectant be fine? Or all 3? For leather seat cleaning...

I use a conditioner for my plastics and vinyl and then my leather and then use an interior DETAILER (doesn't have the stain cleaning and harsher chemicals to CLEAN). A 303 protectant is just that a protectant you would use that and then a detailer in between cleans.