On the topic of oil pans... If you're wondering how I get them so clean... I use a 5 gallon bucket filled with 1:1 mix of purple power & water. I let the dirtiest side soak first for 24 hours and then I pull it out and rinse with water and resubmerge the pan on the other side for another 24 hours. I rinse it off the next day and just wipe it down with a blue shop towel. The pan will flash rust pretty fast so I apply a light coat of oil with a shop towel to prevent the flash rust. This pan already has a bit of rust on it for some reason(maybe moisture got into the pan somehow, sands off easy enough). With this method, you can clean 2 dirty pans. I do push it to 3 pans but its gets pretty mucky on the third one. I was thinking about filtering the mucky water and pushing my luck submerging other parts. 2.5 gallons of purple power is $12 at Wally world.
Dirty pan:
Clean pan:
Dirty pan:
Clean pan: