I tried the Scotty Kilmer detergent wash on my friend's 2006 Suzuki Forenza with 116k miles, it simply didn't work. Once your cat is toast I don't think a detergent could fix it (Eric the Car Guy also debunked that claim)
P0420 and P0430 are all related to downstream 02 sensors (they monitor the cats for emission purposes) the upstream ones are very important since they are the ones that provides Air/Fuel ratio to the ECM and they don't give that codes.
I've cleaned the MAF and see if it shows up again, I can't recall when was the last time I've cleaned it.