Rinse them with hot water only. Do not wring them out.. Hang them up to dry. When I use my filters both the pre filter material and felt/wool I get them damp with really hot water before filtering the syrup. They seem to work better. I would not use any kind of bleach until you are done for the season, and very little. Make sue it is un-scented.
2004 - 2012 2x3 flat pan 25 to 60 taps
2012 2x3 new divided pan w/draw off 55 taps
2018 - didn't boil surgery - bought new evaporator
2019 new SML 2x4 raised flue high output evap. 65 taps
made 17 gal syrup
2020 - only put out 53 taps - made 16.25 gal syrup
2021 - going for 50 bags and 50 on tubing