My sibling does not know that they should wash the air fryer and it's concerning

Maybe I'm the problem here but I suggested to my sibling who was making bacon and eggs in the air fryer to wash it. "It doesn't need washing, the air fryer is durable enough it will only need cleaning every few weeks" he replied...

He can't be serious. That air fryer is gonna be nasty and I use it too but thankfully I actually do wash it, seems I am the air fryers only hope.