So, this is a potentially stupid question, but I can't seem to figure it out. Both of my carboy cleaning brushes have rusted along the entire length of the handle despite careful drying and proper storage. Is this one of those things you just have to except will have to be replaced every couple of batches? Will a little rust hurt anything if you utilize the brush only for cleaning and rinse the carboy thoroughly before sanitizing? The're relatively cheap so I have no problem buying one every couple of months, but I was wondering if anyone else has encountered this problem...