Well at the end of the summer, my plan was to bring these 2 Gilles Berthoud saddles inside, but I was not fast enough, and both developed a thin layer of mould on top, and one had an impressive growth underneath.
I washed them off and they have been dry for weeks now.
I am thinking of using this on them, rather than animal-product based Proofride or similar:
https://www.nikwax.com/en-gb/products/leather-restorer/But one of these saddles and the bike it is attached to will need to go back out to the garage at some point. Is there anything I can do? Would covering with a cloth or a plastic bag make things better or worse?
I suspect the saddle that has been ridden (presumably infested with mould deep within the leather) has sagged a bit more than it would have sans mould.
The longer term answer is probably a replacement top but not while I am using that damp garage.