Question: [Friday, 20th Nissan, 5781]
My Kapata has a stain on it and it’s kind of visible and embarrassing to walk around with it. May I clean it during Chol Hamoed?
Yes. If you do not have any other alternative clean and wearable Kapata available then this may be done.
Explanation: It is debated amongst the Poskim of today as to whether the laundry prohibition relevant to Chol Hamoed applies even against cleaning a stain from a clothing and practically one may certainly be lenient regarding his Shabbos clothing of which the ruling is that it may even be completely laundered if it is dirty and there is no other one available to wear.
Sources: See Chol Hamoed Kehilchasa 5:24 and 33