If it's not a classic that you can't wash with water then a regular wash works great. If you're going to use a sealant product that plays well with your polish then a final wipe with your MF towel is plenty. Wolfgang work works with Menzerna. The Pinnacles go well with Pinnacle wax, Meguairs with Meguairs, etc.. you get the idea. There's nothing out there that makes an Eraser, Griots, Menzerna Top Inspection, or IPA a mandatory process and in fact may do more harm than good. If you're jumping around with product types then a wipe down with one of those products may be a good idea.