The skins are not guaranteed washable but if the fleece isn't too long it is possible to wash them.
The recipe is:
1st solution: 20 L H2O, 1400 g coarse salt, 160 mls formic Acid, 40 mls sulfuric Acid.
2nd solution: 20 L H2O, 1000 g salt, 180 g Alum, 160 g Cromitan...this is the one that's hard to get ...we buy it in $400 lots from BASF in Toronto
Soak fleshed skins in each solution for two days and wash out. Stretch on frames and dry in the sun. Sand the back with sandpaper. Card out fleece. That's it in a nutshell. Results can be seen on our website. A well tanned skin should be free from cuts in the leather and free of oily spots on the back and the fleece should end up clean enough to put a baby on if it's washed well enough.
Reprinted courtesy of Carol and John MacLeod, Prince Edward Island, Canada