I like this pen because it lets me bleach my husband’s shirt collars easily. No mess and most importantly – fast! Squeeze some bleach gel on his collar, use the brush side to rub and pop it into the all-whites wash. I’ll let you in on a secret. Even the salespeople at a certain high-end retail shirt shop tell me that they soak their white shirt uniform in a pail of diluted bleach every few months to keep them looking white. So bleach does work. However, I don’t like to wear gloves and fuss with the pail of bleach water. Too busy to do that! I’m just an Oordinary person with 24 hours to do everything! And the chlorine smell is too over-powering I would need to rinse out my husband’s shirts at least 4 or 5 times! So I was very happy that they invented this alternative. It retails for about $7 at Esso-Cheers petrol stations and from NTUC finest.