I was told Sonus Ultra Fine SFX was the least Aggressive ( i.e. less likely to cause minor marring ) but can’t find a supplier with it in stock. One supplier suggested Valet Pro “Orange” Ultra Fine Clay bar. Has anyone used either of these , ideally love a comparative between the 2. Or a comparison with Meguairs Smooth Clay kit or Bilt Hamber Soft Clay bar , as I have used these. IMO I think Bilt Hamber is great value but more aggressive than Meguairs. More gut feeling. Having machine polished her in the summer, with 3 Ms least aggressive swirl remover. I only need to remove the lightest contamination. Any views appreciated.