I think what Ivan suggests is foam/dwell/rinse then foam again however he still is using a bucket with the DIY incredible suds In addition to the second foaming.
With the first foam/dwell/rinse he should be eliminating the lions share of the dirt. If not then the presoak solution is not adequate.
Applying the second layer of foam should be sufficient to do a contact wash with that second layer of foam.
So the DIY soap in the bucket is overkill in my opinion and is a waste of product. I agree that it is most likely suggested as method to sell more product.
With the first foam/dwell/rinse he should be eliminating the lions share of the dirt. If not then the presoak solution is not adequate.
Applying the second layer of foam should be sufficient to do a contact wash with that second layer of foam.
So the DIY soap in the bucket is overkill in my opinion and is a waste of product. I agree that it is most likely suggested as method to sell more product.