been useing these sheets for years now and this is how i clean them each time, wait till i get about 8 then do the clean on them outside in a bucket hot saopy water, then when somewhere near chuck them in the washing machine, the secret to getting them like new each time is besides adding the normal washing powder, squirt a good dose of FAIRY liquid in the door on them, must be FAIRY as no other cheap alternative works for me!
this is how it looks after a filtering session and taken out the clamptop

hold one end of the sheet and with the other hand sqeeze tight and drop all crap into bucket

rinsed out in a bucket of hot soap FAIRY liquid water

some i cleaned earlier...

Nice and clean after the washing machine

And here we are ready to filter again

