Venice turpentine - keeping brush usable

[Dreamer]

Does anyone have a tip on keeping a brush that's been used in Venice turpentine usable/ soft?
I went to use mine today and I have several rock hard brushes that are worthless. I bought one of those brush/bottles combos and the cap prevents the brush from reaching down into the Venice turpentine. My trimmer took a bit much off my boy and I'm trying to help his hooves toughen up.

[Chisamba]

I go the the dollar store buy a dozen or so tooth brushes, use and dispose when unusable. One usually lasts for a week or so