Hello

!
I have a pair of K501 Headphones that are in daily use since the year they came out. The Earpads have been flushed under lukewarm water from time to time and then dried before Reassembly. Despite this they have collected Dust and Dirt over the years. I now want to give them a thorough cleaning, using more than just water, but I don`t know what Detergents I can use that are not aggressive to the Earpad materials. Are they stable enough to be put into the washing machine? Any helpfull suggestions are appreciated.
Greetings,
ILoveHiFi