That lint build up is common even with a good vent run. My HE3 Gas Dryer and an older Kenmore Gas dryer looks like this after just 1 year of use. I don't understand it. I clean the lint constantly after each large load. Leave some of the lint on the screen if it is very light. The dryer is always more packed with lint than the vent run outside. It must be something to do with the design of the front blower. I have always thought it had a very low volume flow of air even when clean.
Sounds like the washer is now clean as new!!
B
Sounds like the washer is now clean as new!!
B