l had great resaults with a thick cotton towel on my charcoal powered Seat arosa.
After about 2 or 3 thousant km the original paperfilter was just mildly gray. It did a exelent job at cleaning the soot and ash out, while it was wery breathable. All the knots add to its surface area. For cleaning, just pull the sack out (like seen on the picture) and shake the soot cake off.
But that is relatively dry chargas. For wet woodgas, l have no idea how the towel will perform.
l am planning to test it out thugh. l have all prepared but hadnt yet got time to assemble it.
If that doesent work, l “borrowed” a sack from a original sack filter used to filter air from pneumatic transported lime and limestone powder at wotk, its a wery thick artificial pabric, similar to vacuum cleaner bags. So, if the towel doesent work, this gets in.
But it is a lot less breathable!