Hammergjh,
I do think that Discwasher brushes have to be replaced after they have seen a lot of use even if they visually still look good. The brush removes particulate and greasy soils from the record. The particulates can be removed from the brush with another brush but the grease and detergent residue remains. Over time, the concentration of grease and detergent residue will build-up on the brush and result in excessive redeposition back onto the record. It may be possible to just periodically rinse the brush with distilled water to help lift the detergent and grease residue off the brush. The problem is you can never be certain how clean the brush is after it has cleaned a lot of records. Note: I've never searched various audio forums to see if this issue has been adequately addressed. The answer may be buried in one of the audio forum websites.
Mr. Kidknow
