Perfect for bleaching grout!
I buy this to use for bleaching grout in the shower!  I saw this tip on Pinterest.  You carefully and in a well ventilated area - soak the cotton in the bleach and then apply it to grout, letting it sit for a bit.  When you remove the cotton coil, your grout is white.  Worked great and this cotton coil is a nice quality and price!
Rating: 5 stars