Well the 70u is about as small of a screen you want to clean thru. you can clean thru a 50u but its extremely slow going work. it can take alooong time to clean a very smalla mount of resin and once its cleaned you will find whats on top of your 70u blows it away.
I usualy send the botton tray collection to friends who cook with it.
Thanks for sharing.. great shots

Bubble man