Take the valve covers off and the oil pan if you can. That's where are the residual gunk will be. Then clean those up at the very least.
Does R&P *really* clean the guts/moving parts of the engine or does it break loose deposits in the sump and eventually send those to the oil filter?
I mean, I get this fascination about pulling dip sticks and making the OMG face for your YT video cause all the varnish is gone, but not a single engine ever has benefited from a cleaner dip stick. Just sayin.