The SMR removes everything (not clear coat) off of your paint. It has an obvious mild abrasive in the solvent, which removes surface buildup. You will commonly hear Autopians removing
Klasse or Zano with SMR. It will take everything off of the paint.
So, you realistically do not need to use a paint cleaner, as the SMR will take care of that for you.
Don't forget to get some pics of the before, and the after. I will be honest, if you do it right, the results are amazing.
Best regards.