These filter socks are available in different sizes for different sized sumps:
Once any live creatures are evacuated from the sock, the sock is ready to clean.
If you simply rinse the socks in a sink the pores are so tight very little debris will be removed. When you put them back the sump they will clog more quickly. Some hobbyists take them outside and use a power washer to hose them off; that works okay.
My preferred method is to put dirty socks in a washing machine with some bleach. Since bleach and aquariums don't mix, please read the exact steps of how to wash your filter socks with bleach and by the time you get that final step, your filter socks will be safe to be used in your sump filter again, and your pets will be happy.
If you use a washing machine to clean your socks it may be prudent to collect a group of 6 or 12 dirty socks before running a load. Just store dirty socks in a bucket with a lid (they stink). It makes washing more efficient.