Thanks Bunny. I also have the same issue with well water (iron) so constantly battling that too including with a water softener and ditto hate putting bleach down the sink. I have a front-loader which isn’t helpful with soaking so usually do my bleach soaking in a baby-bath and then pour the bleach onto my front patio in the hope that it’ll also kill the weeds that grow up between the stones. I’ll try Borax.
My most recent issue is a really good quality red bath sheet that’s disappeared and been replaced by a $10 bath-towel, much smaller, of the same color. Seemed like an honest switch/mistake - the bath sheet was among the towels in a room occupied by a teenager. But the parents have sworn that they don’t have my bath sheet and, furthermore, that the strange red towel, that wasn’t there before their stay, isn’t theirs. I’m going to have to eat it but have now removed all the quality towels and, going forward, guests are getting regular towels that’ll be floor-rags in a couple of years, and I won’t be mad if they disappear.